Here are some useful questions from this week:
1. What is the difference between "By contrast" and "In contrast"?
There is no difference. You can use either.
2. Can I use idioms like "pain in the neck" or "it was raining cats and dogs" in academic speaking part 2 and 3?
It really depends on the context, and there are various types of idiom. Read this lesson for more information. Note: I'd definitely avoid saying "it's raining cats and dogs" because no English speakers really use this expression nowadays.
3. What percentage of the writing score is task 1?
Task 1 is worth one third of the score (33%).
4. What should I write in the conclusion if the question only asks me to discuss (it doesn't ask for an opinion)?
Don't write an opinion. Just repeat / summarise the main points that you discussed.
5. Will I get a half point in the listening test if the answer is half correct?
No, there are no half points. The answer is either right or wrong.
6. Is "15th November" two words or three?
It's two words, or one word and a number.
7. Is it ok to write "T, F, NG" instead of "true, false, not given"?
Yes, it's acceptable, but I would write the full word because that's what the question tells you to do.