To effectively read the ncert it would take preparation from some time before. Add the important points written in your notes in the space beside the main text of ncert so your notes and ncert will be in one place, this will help you save time in the last days.
Now to read the chapters you need to read the chapter as it is and then solve the questions just after that to check your retention, you can use coaching modules for solving questions.
After solving questions give a break to the chapter for 2-3 days and then use biology handbook for revision of the chapter, the handbook has the important diagrams, statements in the form of true false and fill in the blanks.
This is the way I used to clear neet in my first attempt and I think is a very effective way to deal with biology.
As last 2-3 months are very much crucial for NEET preparation and most of the questions or I should say 95% of your questions are going to come from NCERT so in last months just focus on NCERT for Biology and inorganic,organic chemistry and summary and points to ponder of physics NCERT you don’t have to read chapters of physics NCERT when you read your NCERT make sure you have highlighters of 2-3 color so that you can highlight important things and revise them quickly just before exams as many things in NCERT are not given but are asked in exam so note down that at sides of your NCERT and revise it again and again make a daily schedule of reading at least 2-3 chapters of NCERT and also solve questions after reading so that you can analyse how much you have learned
I will tell subjectwise approach for ncert :-
1)physics:-as we have only 3 month and if you have not studied ncert till now than my suggestion will be not to read ncert go only through points to ponder and summary of ncert
2)chemistry:-inorganic ncert is most important read it no of times and mark important thing and during revision go only through that points,decision of important point will be based on pyqs
For physical chemistry atleast go through suface chemistry through ncert
For organic atleast go through biomolecules,polymers,drug and its uses,enviromental chemistry
3)biology:- as we all know biology ncert is consider as god book for neet aspirants
Focus on following points:-
Start from the basics. Thoroughly read your NCERTs. Read it one time then another and then another.
Every time you read NCERT, you will find something new which will stimulate your grey cells. This is especially true for Biology.
By reading NCERT means all the texts, diagrams, captions, summary, points to ponder, tables.
Do all the in-text, solved and exercise questions.
Solve questions from NCERT exemplar, both subjective and objective.