Hi Suheb,

Yes, you can crack the exam. But you have to do proper analysis first that what will be your study pattern, time management. Time management is the most important thing. JEE Mains is MCQ based paper so you have to quick. Study smart, cover the most important topics first.

Thank you and best of luck. 

Hello dear, 

It depends on person to person. Some people can learn things early while it takes time for some to learn the same concept. It depends on your learning power. 

Apart from coaching, yes you should study 7 hours or so to clear mains. Focus on self study as it helps you to grow. 

All the best!