I also remembered the whole periodic table. It was fun doing that. I had completed 85% of my JEE advanced syllabus in 4 months. So I used to study for about 14–15 hours a day. My time table is also very unique.
One day (around the end of September 2015), I sat and thought a lot about the solution to this problem for whole of the day. Then I devised some techniques to save time, classified topics and arranged them in a specific order so that the efficiency can be maximized. I don’t remember all of them but some of them are as listed below:
  1. Divide your time between Physics, Chemistry and Maths so that you can study each of them daily.
  2. Wake up daily at 7 AM. Just brush your teeth and wash your face and have breakfast. Don’t take bath in the morning.
  3. Always start your day with maths. In the beginning of the day, you are very efficient and mathematics is the one subject which needs whole of your brain. I used to start with 5–6 hours maths daily.
  4. After doing maths, the clock strikes around 2. Now you will feel exhausted. At this time you may take your bath and have your food. Due to the bath, you will regain the freshness of morning. And now you may start with Physics or Physical Chemistry topics. These topics require a relatively lesser brain. Study them for as long as you can and then switch to the Inorganic and organic chemistry.
  5. When it is around 7 you can switch to the organic and inorganic chemistry because these subjects require a lot of theory and lesser brain.
  6. When you are near the end of your day ( I ended at around 1 or 2), just plan what and how will you do the next day.
  7. Do questions in the morning and theory in the evening. Do questions on whatever theory was studied by you overnight.
It was a very torturing time table. It's like using yourself like a machine.
  • Outcome :
I was able to complete almost 95% of the syllabus till January end and that too very thoroughly. Then I switched to Board preparation. I did a lot practice papers before Mains and Advanced. Finally my scores in various exams are :
  1. AIR 247 in JEE Advanced. (224/372)
  2. AIR 1514 in JEE Mains. (254/360)
  3. 372/450 in BITSAT.
  4. 94.8 % in CBSE Board.

How do I score a rank below 1000 in the JEE Mains 2017

Regarding routine and schedule:
1) Try to devote about 5 hours on working days, and about 12 hours on non-working days.
2)  The schedule that works best for me is to take afternoon nap for about 2  hours. If you are studying since morning (in school or at home), you  tend to be less efficient in the afternoon. Better take a nap, and study  late in the night.
3) When you have break from school (autumn break,  break before and after preboards), try sleeping fewer hours - for me 6  hours worked fine. My usual schedule involved getting up at 7 am,  studying till afternoon, nap from 3 pm to 5 pm, studying from evening  till 3 am, and sleeping from 3 am to 7 am.
Don't sleep until late in the morning. Sleep by 2-3 am in the night, so that you don't feel tired the next day.
Change this habit of afternoon nap close to the exam (about one week).
4)  Try to utilise school time: CBSE demands 75% attendance. There is no  need to have more attendance than that unless you really learn a lot in  the classes. You can skip going to school when there are fewer lectures.  Utilise free time in school for studying. Don't spend undue time on  completing practical files - just complete them in the minimal possible  time.
5) Go out for walking / jogging / cycling for 20-30 minutes in the evening, to refresh yourself.

Some general tips:
1) Avoid studying on the bed: You tend to be more lethargic on the bed.
2) Keep your phone (if you have one) few metres from you when studying.

I would suggest Four Phase Approach, that was recommended by Manmohan Gupta (maths teacher at VMC):
Phase 1 – Learning Phase
In this phase, you should
(a)  Attempt the problem. Don’t jump to the solution  immediately. Try at  least 5-20 minutes. 5 minutes, if you don’t  understand question  properly and 20 minutes if you are getting ideas or  almost solve it. So  average time spent on each question should be around  10-15 minutes. If  you have solutions, refer them otherwise mark them  and refer solutions  later.
(b) Mark levels. After you have gone through the  solutions,  you need to decide the level of the question and mark it with  each  question. There can be 4 levels.
Easy : Problem is easy if you are able to solve (without even looking at the solution) it in less than 5 minutes.
Average : Problem is average if  you are able to solve it by just glancing the solution. You look at  the  solution for less than 1 minute and get the idea. Or you could do  it  yourself by trying hard and spend more time to solve it.
Difficult : Problem is difficult if you are not able to do it yourself (after spending lot of time) and   to understand the solution you have to spend more time on each step  and  finding little hard to understand the steps. But finally able to   understand solution very well. 
Very-Difficult : Mark a problem a very-difficult if either you are not able to understand the question or question is   clear but finding almost impossible to understand the solution or you   find either question is wrong or solution is wrong. Don’t waste time on   such questions. May be you can tackle them later when you get time.  But  at this stage they are useless and pull your confidence down.

What is the best ways to prepare for iit exam?

Frankly speaking there is no any rocket science for preparation for your IIT exam,its all about hard work afterall.Below are the some of the ways to excel in exam.

  • Regular study with time table for 4-5 hours is minimum criteria.
  • Try to focus on concepts rather than jumping to question without proper concepts.imphasis should be given to concepts and problems.
  • Follow good books and material from good coaching institute.
  • Give enough mocks and work hard on your weak areas.analyse yours test series results.
  • Learn all the formulaes and make a notebook for important concepts.
  • Divide your time table subjectwise and focus on each accordingly.
  • Dont be irregular in studies.