Everyone can be recognized by Purin relatively, but it is better to be a little harder, so I have time to be Balang, although Balang is a little biased.

In fact, the reference book of SAT2 is not very important, mainly depends on how you learn it yourself. I think this is still quite difficult to surprise.

I was basically naked that year. . . . .

Remember to sleep on the first day! ! This is very important. Don't worry.

Precal is a little simple. . Really. . .

Just look at the textbook of freshman according to the knowledge points.

It is simple to recommend James Stwart's univariate calculus.