Go for CareerOrbits test series.
It is the best test series for chapter-wise preparation for NEET.
I have enrolled in their Ultra Test Series for NEET 2021. The test series takes care of my practice and testing needs.
There is a question bank in the test series with NEET level important questions. After attempting these questions, I can clear my doubts on the questions that I have made mistakes in.
This can be done with the step by step doubt clearance available for every single question.
Moreover, the questions where I have made mistakes are available for me to practice in the Revision Lists. There revision lists are the best.
Suppose I make mistake in a question of physics, then they would add this question to my revision list for practice. After some time, I have to attempt these questions again and try to attempt it correctly. By repeatedly practicing them here, I am able to solve questions correctly.
Also, there are chapter tests, minor tests and mock tests available in the test series that I attempt after completing a chapter.