Dear aspirant;

There is only 4-5 months left before the NEET examination. So, that is not enough time to start over with the whole course. It will be better if you just solve the chapters you have already understood properly. Now the Chapters and subjects that you don't seem to have command over, you need to start properly and from the very beginning itself.

Biology is the most important one. Just study NCERT and solve GRB questions ; that'll be enough here. For chemistry NCERT is more preferable as well.

Physics is vital here. You need to solve as many previous year questions as you can here. That'll give you boost in your confidence.

Hope this helps and all the best!