Marcellini and Sbordone prove every theorem. You do not need to memorize every proof. Learn the proofs for the fundamental theorems:
: It is noted for balancing formal proofs with clear explanatory prose and worked examples. --- Elementi Di Analisi Matematica 1 Marcellini Sbordone Pdf
Do 20% easy exercises for confidence. Do 70% medium exercises for exam preparation. Attempt 10% hard exercises (marked with * or **) if you want a top grade. Marcellini and Sbordone prove every theorem