The university I went to was notorious for having their own textbook for Analysis 1 and 2 that had 1600 or so exercises of just calculations and covering all ca

The university I went to was notorious for having their own textbook for Analysis 1 and 2 that had 1600 or so exercises of just calculations and covering all cases(for example, if a theorem gave you 3 conditions for it to work you would work through 3 examples with one condition not present and how the theorem would fail, and stuff like). It was completely different to a theory textbook like Rudin/Tao, which had fewer exercises that were more focused on "did you understand the abstract object" and "use your knowledge to prove this slightly modified proposition or easy extension of the theorem". If you want to practice addition/subtraction I suggest Zetamac(https://arithmetic.zetamac.com/ https://arithmetic.zetamac.com/), this is what most people use to train for HFT/MM interviews(although I heard there are more specialized tests now).