Hi,

I would say that you should have started earlier but it is not impossible to start and get a good enough score in NEET 2020 as I am assuming that you would have been completing your 12th board right now and that means you have done enough of the subjective and objective type practice as per the new pattern that was introduced by CBSE this yearn,you need to focus more on the objective MCQ rather than the subjective part, you can focus on objective part  by solving past year question papers and getting books that aim at MCQ type questions, focus on chapter wise revision and not take up anything new or any topic that you didn't already revise for your boards.