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First of all, you should complete the syllabus of class 12 and then start revising class 11 syllabus and in this way, you can be free of burden of class 12 board exam. Only then you can be free of pressure and can study well. You should take any coaching center or private tuitions for the help. You should also contact the school teachers to share the experience of them and the most important thing you have to share is the equal amount of time in PCM and a lot of hard work is required. For clearing concepts of class 11, you should try books like HC Verma, R D Sharma (objective) and Himanshu Pandey (Organic chemistry) . The main thing is to set a target daily and then in the end, revise all the things. Just only thinking that I want to clear IIT Mains exams will not help you. You will have to work hard.

Aaditya,
It is always a good decision to go for an integrated degree as it gives you many benefits. First benefit is the duration, which in integrated degree is going to be less I.e 5 years, otherwise it will take 6 years. You save 1 year in integrated degree. Second is fees, which is not going to increase as you go for higher degree but if you take admission in higher degree separately, it is going to be higher. Third is going to be that you will be tension free, you don't have to bother about admission to higher degree after completion of the lower one and also you don't have to prepare/ appear for any entrance test.
LPU is one of the best universities in the country with world class infrastructure, modern facilities and highly qualified faculty from IITs, IIITs, NITs, etc. The university is having tie ups with many foreign universities and reputed companies thus facilitating higher education abroad and good placements respectively for their students.
University prepares its students for placements through special inputs in the form of placement classes. Students have been offered package as high as 20 lacs pa. Please check the link below for more details http://www.lpu.in/placements.php
Not only this, but the university has also set up a high tech lab.s and studios for the benefit of students. The university provides scholarships and study/ education loan assistance to the students. Without doubt LPU is the best so, go ahead. For more information, visit LPU camp office in your town:
http://www.lpu.in/admission/lpu-in-your-town.php#lpu-town