Dear akshita bhatt
You have lost lot of time ,now you need to give 2 to 3 time more effort than other students.then only you can crack IIT JEE.
Now main problem is time management.
so i will sugest you to join online coaching for IIT JEE. where you can learn new chapter .as well as you can have recorded lecturer of previous chapter that you have missed at flexible timing.
So i wud advise you to join Askiitians.com.
 
 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.Refer good books and always try to solve problems

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 preparation. 

 All the best Akshita batt. 
 
Regards, 
Askiitians Experts 
Badiuddin