>>12678522calc 1:
Grab Lang's calculus start reading from the beginning, do every single problem and try to prove every theorem before reading Lang's proofs. Do the same for your current book as well. Create a timetable (finish a section before b date style) such that you finish the school book (whatever chapter the class ends on) the week before finals do the same for Lang's book. When you finish a section early you should move every date forward the amount of time you finished early.
Calc 2: Same as above. Calc 3 Use Lang's Multivariable.
Once you learn the skill of reading math books like this grad school awaits.
>>12678623This except you should have the self-discipline to use your computer as a tool to speed up your ability to read and write math. You should have both your books open in pdf on your computer, and you should be latexing/wording your exercises and proofs.