i'm very weak in physics specially in 12th syllabus .so how can i prepare for passing cutoff in jee and other respectfull competitions within 2 months.i have good command
on heat & thermodynamics,modern physics.

Dear sagar

you need to work hard on the topic in which you are weak. only three topics are not sufficient to crack IIT JEE.

cover at least these topics

 General physics,Optics, Modern physics, Thermodynamics, A/C circuits, Fluid mechanics, Experiments.

I will suggest you some books  ,Refer chapter from the books for which it is recommended.

For BOOKS you can see  this link

http://www.askiitians.com/Important-books-iit-jee.aspx

you should also see the previous years IIT JEE problem .Try to solve as much problem as you can

you can join doubt removal session provided by AskIITians .

click here for more details about the packages in Askiitians .com :
 www.askiitians.com/packages.aspx

Just stay calm and focus on understanding rather than mugging. Be regular in class and stay with concepts

Please feel free to post as many doubts on our discussion forum as you can.
 If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
 We are all IITians and here to help you in your IIT JEE  & AIEEE preparation.

 All the best.
 
Regards,
Askiitians Experts
Badiuddin