Can I achieve IIT by reading 12hours aday in October November and December

Yes you can if you are utilising your 12 hours in studying(after having your concepts clear)......but that's not so easy because it's one of the most competitive exams conducted in india.......many aspirants are preparing for this exam......so solve as many questions as you can and be motivated.....
Best of luck!!

Why not! All the competitive exams are a cumulative effort of all the years of hardwork. They may seem new but they are all old concepts. All you need is discipling yourself. Time management, motivation and hardwork , the combination of this trio will get you anything.

There may be plenty of questions but the core concepts will always remains the same, grasp them and your seat is secured.

Never doubt yourself. As long as you believe in it, you can achieve it!

Goodluck

No i can't achieve iit by reading 12 hours  in a day

IIT JEE is one of the competitive exam in India. Lot of hard work is required to crack this exam. You need quality of time not quantity to score good marks. If you are studying 12 hours a day make it count don't waste your time. There are students who have cracked this exam in 3 months. You should be highly motivated and determined to archive your goal. You can easily crack JEE exam if your concepts are clear and you have completed all the important topics which carries more weight-age in the exam. Make sure your NCERT is completed. After, NCERT you can go for HC Verma and Resnick Halliday for Physics. Morrison Boyd for Chemistry. For Mathematics you need to do lot of practice. You should also refer previous year papers to understand the level of questions and mock test series to check your preparation level at regular interval of time. All the Best!!