High school mathematics is generally divided into 9(A) or 9(B) versions in the second semester of senior two.

The logical thinking method used in 9(A) is a bit difficult, and many students have a headache when they see it. The space vector method used in 9(B) is very simple. This is also a more general version now!

The advantage of 9(A) is that it can exercise your logical thinking and help you learn math. So these two kinds have their own advantages, but I like the A version.