10–12 hours is a must for a NEET/AIIMS aspirant.

Set a Target for the week.

I'm going to give you a specimen routine Follow the same principle and set your own routine according to your school or coaching hours.

• Start your day at 5/6AM in the morning and read something which requires lots of memory, for instance zoology or botany. Do it for 3 hours.Take 2–3 minutes break in between every 1 hour. Its very important.
• After that take an hour gap to complete your breakfast and stuffs.
• From 10AM start doing Physics. Continue for 3 hours. During this time stay very focussed and don't take random short breaks. Try to do at least 90 sums in two hours. This time bound practice would help you to manage time in exam room. NEET is that kind of exam where most students know how to solve the question but cannot manage time.
• At 1:00/1:30PM go for your lunch. Give a long gap of 2 hours as you have already studied 6 hours at a stretch. Your brain needs some time to get itself back to work.
• Then sit again from 4PM to 7PM. If you have already studied Botany in the morning, study zoology now. I sometimes keep this 3 hours for solving a mock paper. I simulate examination hall environment and complete the paper within that stipulated time.
• 8–9 and then 10–12 keep this time for chemistry (my favourite subject!).Solve physical, solve organic, whatever you want you have the full freedom. But be clear with your concepts. GOC is a must. Be thorough with the name reactions and its mechanism (FOLLOW S.N SANYAL).
• Sleep tight! Its a must thing. Your brain needs rest and a time to prepare for the next day's schedule.

SOME MORE FREE ADVICE: ( Thank me later. ;-)

• Say no to android or iOS, friends, relationship, and things that deviates your focus and are very unimportant for your examination.
• Practice on OMR.Try to solve 90 MCQs every day.
• Join a coaching.Notes of coaching are gems.
• Don't neglect NCERT. Its bible.Give as many mocks you can.
• Join dlp of Allen if you already enrolled yourself in coaching facilities in your state. Its really good for NEET and AIIMS.
• Stay motivated.
• Talk to your parents when you feel low. Have a good friend who is also an aspirant. Discuss study with him/her.

Don't waste time. It doesn't come back. You will regret after the result. So sacrifice a year. Medical college will be the coolest thing that will ever happen to you. Now you decide do you want to be cool now and not get chance or stay cooler for the rest of your life.Listen to your parents. They don't speak shits. They have already experienced life in an efficient manner and are much smarter than you. Respect them.

Study hard!