2. Check the calculation carefully, and pay attention to the examination of the problem when solving the equation.

It depends on the habits of your researchers. Ask the teacher.

4. Our exam is extremely difficult-it shouldn't be suitable for you-most of our exams are Olympiad-you look through your exercise books, which are better and have more reprints.

I woke up by reciting the formulas of those numbers.

Note: It may be helpful for you to read the questions in Grade One.