The meals are taken care of by the teachers so that the 12th grade students can rest assured to study for the exam. Starting from 9-6, every day, the canteen of Trung An High School is bustling from dawn. The teachers went to the market to buy food and then went back to prepare and cook. At about 10 o’clock, the dishes were finished, they made a portion of rice so that the children could have rice to eat after school. On the day we arrived, the teachers were preparing 200 meals with 30 vegetarian meals according to the students’ needs, the rest was salty food. The teachers are “non-specialist chefs”, but the meal is very attractive: braised shrimp, melon soup cooked with meat, stir-fried vegetables; and vegetarian dishes are fried mushrooms, vegetarian rolls… and dessert is watermelon. The children who ate the rice were all touched and praised. The image that touched many people was that the teachers were all working in the kitchen. The girls stand in the kitchen to fry, the teachers prepare vegetables, make shrimp, cut meat… the atmosphere is bustling and full of fun. Helping teachers with 12th graders who do not have classes, some parents of students near the school also support and especially students who have just finished 10th and 11th grade assigned to groups. to the canteen to help teachers. Trinh Minh Thanh, who is about to enter grade 12, shared: “I came to help my teachers cook for my brothers and sisters. We want to empower you to confidently enter the exam. Besides, next year I will be in 12th grade, and then I will be supported by the students in the lower grades like that.” Mr. Le Van Dung, Principal of Trung An High School, said: The model of cooking lunch for grade 12 students during the preparation time for the high school graduation exam has been implemented by the school for the past 3 years. This year, the scale of cooking is more with 200 meals per day or more. Because this is the time of “sprint”, the school creates conditions for the children to have lunch, take advantage of the rest to review in the afternoon. Besides, the organization of eating at school also ensures food hygiene and safety, and fosters the spirit of the students to strive for learning. Mr. Dung added that, in order to implement cooking for students, right from the beginning of the second semester of the school year, the school planned and informed the students’ parents, receiving enthusiastic response. The cost of cooking is from the socialization of students’ parents, school teachers and benefactors. Ms. Nguyen Thi Chinh, a clerical worker at Trung An High School, who goes to the market to cook every day, said: Right from noon the previous day, the teachers discussed with each other what the menu for the next day was. After the menu is available, the teacher will notify the class president so that the students can notify their friends and register for a meal, including vegetarian and non-vegetarian. From 6 am the next morning, Ms. Chinh went to the market with a carefully calculated amount of food. Just like that, the meals for students are more and more professional and delicious. Chinh smiled gently: “I’m happy to see the children eat well and satisfy their appetite”. As for Mr. Vo Cong Minh, Secretary of the Union of Trung An High School, always present early every day to finish the meal for the newly returned students, sharing: “Teachers want to contribute a little effort so that the children can have more motivation. Successful completion of the upcoming exam”. For the 12th graders, when talking about school lunches, each student has an emotion, but they all express their gratitude to their teachers for their concern. The children confided that, seeing the teachers who are busy with chalk on the podium every day in the kitchen cooking each dish, it was really touching. There are many children from far away, who register to eat at school in time to rest in the afternoon to continue studying; I have a brother, my parents work all day, so I choose to stay at school to eat lunch with my friends. But there are also children who choose to have lunch at school for a very lovely reason. Truong Thi Bao Tran, grade 12, shared: “I choose to eat at school to chat with friends and teachers. It won’t be long before we have to leave school and teachers.” There are meals that are seasoned with love, cooked with the love of teachers. Therefore, the children borrowed the name of a reality TV show that “varied” when talking about meals at Trung An High School: “Prepare the rice the teachers cooked!”.

12th grade students AT.1 Gia Dinh High School in Biology class. Illustration Ecology (Biology grade 12) is the part with close knowledge, easy to deduce, so it can be called “easy”. However, the amount of knowledge in this section is very much, so if not codified, it will be “difficult”. Ecology section consists of 3 chapters, 11 lessons, students need to systematize knowledge and understand ecological terms. Specifically in Lesson 35 Habitat and ecological factors , in Chapter I Individuals and biomes , students need the system of ecological factors to include Infertility factor (physical factor and chemical factor) and the existential factor (the organic world and the relationship between organisms). The example in the reference year 2021 Question 87: Which of the following ecological factors is the infertility factor? A. Worm. B. Light. C. Worms that eat rice leaves. D. Rice plants. We can easily know that answers A, C, D belong to the existential factor, and answer B is the physical factor – the infertility factor. Besides, we need to understand about ecological limit and ecological drive. In the ecological limit, it is necessary to know the tolerance interval, the favorable interval, the lethal point, the positive point and we can adopt the example of the ecological limit of Tilapia for easier understanding. Students need to be able to distinguish ecological drive and accommodation to avoid confusion we can remember accommodation is just a place of residence still Ecological drive shows the way that species lives. Next, we need to note about the adaptation of the organism to temperature, it is necessary to understand the two Principles of Becman and Alen. Becman’s Rule tells us that “Thermostats live in temperate regions larger body size compared with animals of the same species or closely related species living in warm tropics. We can remember quickly “Body size: animals in temperate> tropical animals”. About the Anlen rule “ Tropical animals that live in temperate regions have ears, tails, and limbs usually smaller ears, tails, and limbs of similar animals living in hot regions ”. Can remember quickly “ Sizing of parts: tropical animals> temperate animals “. Students in grade 12AT.1, Gia Dinh High School are making mind maps for lesson 35 One of the content that frequently appears in the exam is Lesson 40 Biomes and some basic features of biomes. First of all, they need a system of relationships between species in a community. Example from 2021 references Question 89: In biomes, which of the following ecological relationships belong to the supportive relationship between species. A. Parasites. B. Inhibition – sensitization. C. Competition. D. Symbiosis. When the systematization is easy, we can immediately choose the answer D. At the same time, it is necessary to understand relationship forms and take illustrative examples to easily remember. Test papers often give specific examples asking what relationship it is? Example from 2021 references Question 95: During the breeding season, females in the stork population compete for a favorable place to nest. Here’s an example of a relationship A. competing for the same species. B. supporting the same species. C. Assembly. D. cooperation. Based on the title “female individuals in the stork population” meaning “of the same species”, they “contested”. , We conclude this is an example of a competitive relationship with a species. So for this type of question, we rely on phrases, keywords, and clauses of the question to make inferences. The next and most frequently appearing examples on the test are food chains and food webs. Regarding the food chain, we need to note that there are two types of food chains: the food chain starts from the autotrophic organism and the food chain starts from the organic humus decomposing organism. In food chains and webs, it is easy to confuse the “number” between the nutrient level and the consuming organism. Illustration : Floating plants -> Invertebrates -> Small fish -> Large fish Floating plants are organisms that produce a level 1 nutrient Invertebrates are a primary consumer but are a tier 2 nutrient. Small fish is a tier 2 consumer but is a tier 3 nutrient. Larger fish are tertiary consumers but are a level 4 consumer. Example from 2021 references Question 103: Feeding the food chain: Rice plants Deep eating rice leaves Field frog Hawthorn cobra. In this food chain, which organism belongs to the tertiary consumer group? A. The hawk. B. The bronze frog. C. Worms that eat rice leaves. D. Cobra. With a clear understanding and clear knowledge system, it is easy to identify the Cobra as a third-order consumer. Through basic analysis of the above contents, we easily recognize one thing: Knowledge of Ecology is not difficult, just systematized by mind maps, images, tables, … then we easily solve the questions in the exam. Please plan to systematize your knowledge with mind maps for the Ecology section to do well the 7 questions of Ecology in the high school graduation exam. Based on the 2021 high school graduation exam illustrative exam questions, we can see that the Genetic Mechanism and Variation 9 sentences (with 1 sentence of high application), The genetic rule has 10 sentences (4 sentences with high volatility 2-sentence population genetics (1 sentence highly manipulated), 1-sentence application of genetics, 1-sentence Genealogy genetics, 6-sentence evolution (1 sentence to apply), 7-sentence ecology (1 sentence and Biology in Grade 11 has 4 sentences. Thus, basic knowledge is 7.5 points, applying 1.5 points low and applying 1 point high. We can see that the content of Biology subject with a huge amount of knowledge, to facilitate learning and review students need to systematize knowledge is essential. If students have a clear study and study plan, scoring 7-8 is entirely possible.