How to read math books

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I am still in the foundation part and this book is taking too much time.
I am reading every chapter and doing every exercise.Am I doing it wrong ?
I want to go through it exactly in 4 months. Should I just follow this schedule ?
https://ocw.mit.edu/courses/mathematics/18-014-calculus-with-theory-fall-2010/
It suggests the necessary reading and assignments.
What do ?