Ok, i know this might seem like a stupid question but please help me out. Im in year 11 now and, well, my essays are not the best, I can manage to get 11/20 in my essay's but some people get 20/20 and i just dont know how they do it, ive asked and they dont really help. Im more of a math/science student and any help, tips for great essays would be great 
Hey there! This is the general structure that I follow when I write essays... it ensures that your ideas are coherent and cohesive!
Introduction
1. Write a general sentence on the topic of the essay question – not necessarily answering the essay question, just providing a statement on the essay topic.
2. The topic sentence of the first body paragraph
3. The topic sentence of the second body paragraph
4. The topic sentence of the third body paragraph
5. Contention (your viewpoint on the topic): do you agree with the essay question, or not? What's your stance on the topic?
Body Paragraph 1 (BP1)
1. The TOPIC SENTENCE of the body paragraph (try not to copy the introduction topic sentence). This can be up to 2-3 sentences.
2. P: Give a POINT and/or feature
3. E: Backup with point with EVIDENCE and/or EXAMPLES.
4. E: ELABORATE on the evidence/example and how it relates to the topic of the body paragraph.
5. L: LINK back the paragraph’s point to the essay topic.
Body Paragraph 2 (BP2)
1. The TOPIC SENTENCE of the body paragraph (try not to copy the introduction topic sentence). This can be up to 2-3 sentences.
2. P: Give a POINT and/or feature
3. E: Backup with point with EVIDENCE and/or EXAMPLES.
4. E: ELABORATE on the evidence/example and how it relates to the topic of the body paragraph.
5. L: LINK back the paragraph’s point to the essay topic.
Body Paragraph 3 (BP3)
1. The TOPIC SENTENCE of the body paragraph (try not to copy the introduction topic sentence). This can be up to 2-3 sentences.
2. P: Give a POINT and/or feature
3. E: Backup with point with EVIDENCE and/or EXAMPLES.
4. E: ELABORATE on the evidence/example and how it relates to the topic of the body paragraph.
5. L: LINK back the paragraph’s point to the essay topic.
Conclusion
1. Repeat your contention that you mentioned in your introduction
2. Repeat your topic sentence from BP1 (preferably in other words)
3. Repeat your topic sentence from BP2 (preferably in other words)
4. Repeat your topic sentence from BP3 (preferably in other words)