The syllabus of NEET is completely similar to the NCERT textbooks.NCERT is fine for the basics.But,as we know now on NTA will be conducting NEET and not CBSE ,studying only from the NCERT textbooks won't be enough.You need to learn extra this time. You need to refer to different books, other than the NCERT to gain more knowledge about the topics.
You can refer to books such as Dinesh,Trueman's,H.C Verma,GRB,Pradeep etc.

Make a schedule.Give each subject equal importance.

But as you learn new stuff don't forget to revise the previous one's.

Try appearing online test series conducted by different coaching institute to help you get accomodated with the exam pattern and the stress during the exam.

But remeber to dilute the pressure.Take some time off to clear your mind and help you focus better.