1 and A are both more difficult and wider than B.

2.a is mainly biased towards the knowledge structure of science and engineering, and B is biased towards the calculation of economics.

Generally speaking, you have done well in A and not badly in B. If you have any questions, you can compare the basic teaching requirements of A and B by yourself. Generally, there are also science students who take an examination of economics, so it is recommended that students who study liberal arts and economics review and prepare for the exam with the difficulty of A as the standard.

Advanced Mathematics (Class A) is an important basic theory course for undergraduate students of science and engineering, which serves to cultivate high-quality professionals needed by China's socialist modernization.

Advanced Mathematics (Class B) is an important basic theoretical course for undergraduates majoring in biology and chemistry, which serves to train high-quality professionals needed for China's socialist modernization.

In China, students majoring in science and engineering (except mathematics, who study mathematical analysis) have difficulty in learning mathematics, which is often called "advanced mathematics" in textbooks; Students majoring in literature and history learn mathematics a little shallower, and their textbooks are often called "calculus". Different majors in science and engineering, literature and history have different degrees of depth. It is advanced mathematics that studies variables, but advanced mathematics does not only study variables. As for the courses related to "advanced mathematics", there are usually: linear algebra (advanced algebra for mathematics majors), probability theory and mathematical statistics (some mathematics majors study independently).

Elementary mathematics studies constants and uniform variables, while advanced mathematics studies non-uniform variables. Advanced mathematics (the general name of several courses) is an important basic subject in science and engineering colleges, and it is also a compulsory mathematics course for non-mathematics majors in science and engineering, as well as a compulsory course for other majors.

References:

Baidu encyclopedia-advanced mathematics