According to a test paper, it takes one hour to calculate, which should be * * * 26 hours in total.

You can do better on the All-A paper, and the questions above are leaner, which will help to improve your grades. It is easier to practice every day. These two papers are both very good, each with its own merits. The number of exercises every day is relatively small, and the types of questions are relatively simple. But its answer analysis is comprehensive and suitable for basic exercises.