The first and foremost thing, to begin with, is to prepare a chart about all the concepts in your NEET Physics syllabus.
Divide the number of chapters from each part of the Chemistry syllabus i.e. organic, inorganic etc.
Prepare Inorganic Chemistry from NCERT Book itself. For Physical Chemistry, it is very important to study theoretical concepts as well as numerical problems from NCERT books.
The next and most important tip in-line is knowing what is important and focusing on it.
Try to solve at least 5 past year's question papers to get an idea of the exam pattern and popular questions.
It is always recommended to solve mock tests in the ideal NEET exam scenario. Setting up a timer and solving within the stipulated time
The night before the exam is very much crucial for your exam and your exam's performance pretty much depends upon that.