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Hi Kamal, the best time to start preparation is at the beginning of 11th class when students are fresh after boards and a lot more can be learnt. Students who start late often end up leaving some key topics of 11th class JEE syllabus.
Also, if you start your preparation in 12th class then the amount of hard work is increased manifold due to additional pressure of 12th boards, so chances of getting a high rank in JEE are decreased.
Concepts in topics like algebra, mechanics and stoichiometry should be studied in great detail as they also form the basis for other topics and are very scoring.
Regular problem solving not only strengthens the concepts, but also increases your mental sharpness which is must for JEE.
You should have systematic plan for the preparation of JEE.
Regular hours should be allotted to mastering concepts and problem-solving.
Try to be analytical rather than being intutive.
Another very important aspect of your JEE preparation will be the coaching institute. I am sending you link of best institutes offering IIT-JEE coaching in and around Delhi.
tinyurl.com/cls2ewt (Delhi)
tinyurl.com/7qa3tsb
(Please place the link in the address bar.)
My advice would be, choose an institute which has good success rate, check how old is the institute, batch size, course details, faculty, take feedback from current students and decide wisely.
Hope it helps. Feel free to raise more queries or you may close the question by liking it or marking it as the best answer.
All the best!

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