You can rely on NCERT books but it will be not enough if you are preparing for JIPMER Biology. Studying NCERT can help with your preparations but you shouldn’t depend entirely on it. There are no proper explanations or exercise questions for practice.
There are a few other books like Objective Biology by Dinesh, and Arihant Test Series along with NCERT. Reading more books will make your approach more insightful.
Yes, NCERT books are reliable for JIPMER preparation. JIPMER is merged with NEET so you have to set your focus on NEET and NEET follows NCERT mainly. So it's good that you follow NCERT for the preparation.
NCERT alone isn't enough because exams like NEET & JEE are to test your in-depth knowledge which could be gained only if you study various books for strengthening your base.