As you know, NEET 2020 asked whole from NCERT. So, you have to read and study NCERT number of times and prepare notes while studying NCERT. Revise them everyday.
But, You also need to solve MCQs. So, for practicing MCQs, I suggest you must go through the Objective NCERT Gear Ups of Biology, Physics and Chemistry of Altis Vortex Publications.
These books are fully NCERT based. You can practice ample of questions and try to clear your concepts.
Best of Luck🍀