If you are thinking of preparing for IIT-JEE, please choose your coaching classes very seriously. Nissansh Classes neither have good faculties nor the academic environment is suitable to crack competitive exams.
They are not even a bit bothered about the CBSE 12th boards syllabus. You will end up getting low marks in your boards for sure. The course coverage is also not proper.
I would strongly suggest everyone reading this not to waste your time here. Rather get some idea about a good institution in Kota and start your preparation whole-heartedly.
BEST OF LUCK FOR YOUR FUTURE!