well, first of all go through theroy, sequees into concept, make it shrot-cut of that topic. more clear about your concept. make note of this each topic by topic. solving problems also focus.

Dear Tanya
This time you won't get back.  So you need to utilize this to maximum. What I want to say is don't think that JEE is so tough and you can't crack it. Just google the topics which are freqently asked and also having high weightage in JEE.  And cross check those topics in 11 textbooks.  And mainly you need to do now is make your base of that topics to be strong.  For physics,  HC VERMA books makes sense and also RD Sharma for maths. 
If you need some more information,  comment here.
All the best.

11th standard is the best time to prepare for the JEE exams. Because in the 11th class most of the students get confused in most of the concepts of science. As after clearing the 10th class the level suddenly increases and student only tries to pass the exam but not focuses on the concepts that are taught
So in the 11th class if you make your Foundation strong by making the notes of all the concepts which you had been taught. And practicing all the NCERT and the previous year JEE questions could be a good start for your preparation.
And rest of the things you will learn by doing yourself

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