A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic about students and high marks. It does not need other sentences for context. It is a general statement that sets the theme for the following paragraphs. Why other lines are not chosen? Other paragraphs are not chosen because they do not stand alone. For example, "Actually, you don't have to write down everything you know" starts with a transitional word, so it is not independent. "Before writing, you should figure out what the question is after, and what is not relevant" also cannot stand alone as it gives advice without context. "And then you will have an idea of what you should write: write as many points as the number in the question indicates" starts with a conjunction and needs prior information. Lastly, "If there is a 'three', you should arrange your response as three points" uses a conditional phrase that requires context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it gives a clear instruction based on the previous advice. It wraps up the discussion about writing points for exams.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of writing for exams. The word 'Actually' shows a contrast to what students might think about writing everything.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 links to Paragraph 2 because it gives advice on what to do before writing. It logically follows the idea of not writing everything.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains what to do after figuring out the question. The phrase 'And then' shows the next step in the writing process.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it gives a specific example of how to arrange points based on the number in the question. The conditional 'If there is a 'three'' shows a direct link to the previous advice.