I am currently self learning high school level AP Calculus BC over the summer. From a mathematical perspective, I have heard that high school level calculus is just pure and shallow computational work. For this reason, I seek a deeper understanding in calculus. So far, the BC curriculum has been a joke in my eyes. So, what textbooks (Spivak, Apostol etc.) would you recommend so I could learn calculus at a true college level. Once I complete calculus BC I plan on taking a Calc III course at a college when my school year starts again. Also, any additional tips for self-study would be humbly appreciated. :) (I'm going into 11th grade when the next school year starts).