If you want to prepare online then I will not recommend unacedemy because they are running a business model .
I would suggest you
(1) PHYSICS WALLAH
(2) APNI KAKSHA
(3) BIOMENTORS
These three platforms are reliable and they make each and every effort for you selection all depends on you, how sincerely you utilize them .
No gain without pain
Hope this answer is helpful to you all the best for your future 👍.