Hi i like Calculus lifesaver from Adrian Banner. Mainly because it teachs in a down to Earth way, and its a non trivial approach at calculus (like for dummies stuff).
I find elearning videos, boring and like the more active approach that have books.
My main problem is that i study, work, and need time to resolve the class exercises, and prepare for the exams. I prefer to focus on class exercise material than books exercises because, it shows me more about the exam criteria of the class that I am doing.
Previous to Calculus lifesaver, i was using mainly leithold calculus.
Had to put down Spivak and Piskunov. Because i don't understood their more formal approach, get bored, and frustrated, and end wasting more time, searching on youtube/ google, on how to read the theory, and apply the procedures to the exercises (with the risks of using internet, like ending in any site, 4chan, 9gag ) than focusing on study.
Do you know good study guide books, about multivariable calculus, discrete math, linear algebra? with good detailed examples, than exercises? and good books just with exercises, and answers?
And what can i do to at steps, go near to the more formal approach of math, and understand the real books and theory.
I would like a more philosophical/ psychological way of showing math, know what inspired the mathematician to stablish a determinated theory. at now the books i read, have just historical facts. Long books arent my problem.
Thanks, excuse for the errors I am a foreign speaker.