Lord, it's almost the end of sophomore year, right? Should you have finished learning mathematical analysis? But it's not too late. Mathematical analysis needs frequent review and consolidation. I also use the textbooks of China Normal University to share my personal views.

The textbooks of China Normal University are suitable for beginners. I suggest you review frequently. Do all exercises after class (don't turn over the answers). This textbook has a study guide book and a matching workbook: Exact Solution to Mathematical Analysis Exercises. But it is not recommended because there are too many repetitions. If you want to do the problem, I recommend Xie Huiming's Lecture Notes on Mathematical Analysis Exercises. Do it slowly, and you will get something.

As for other textbooks, I don't recommend them. Because different textbooks are written in different ways, as undergraduates, don't touch too many messy things, and read the books of China Normal University thoroughly first. With the follow-up courses, you will have a deeper understanding of mathematical analysis, and then you will chew other books. With a certain foundation, the subject may wish to read Rudin's three-piece set, and it will be a great god if you really understand it.

There are not many books, but they are good. I hope that the subject will sink down and do it bit by bit, and there will be great gains.