"Engineering Mathematical Analysis" Yang is waiting. This is a book written by our school teacher.
If you provide engineering scores, it is more difficult to prove than high scores, but simpler than math scores. I recommend some books on mathematical analysis.
Zhang Zhusheng, a new lecture on mathematical analysis
A Course of Mathematical Analysis by Chang Gengzhe and Shi Jihuai
Although it is used by the department of mathematics, it is easy to understand and I think it should be very helpful to you.