Hello,
Visit the official website for CBSE improvement forms
Enter roll number, which you had in the CBSE last exam.
Enter your school number . In case, you appeared as a private candidate and don't have a school number then you have to enter it.
Enter your examination center number which is mentioned in admit card.
Click on proceed to make the payment online or through E-Challan.
Upload your scanned color photo and scanned copy of bank challan, see the details given above.
Note down your Application Number and Roll Number
Check your fee status if the transaction has been completed.
For preparing JEE i would suggest you to join coaching that are best in your area and don't go on what other say Though akash and fitjee are reputed coaching that provide good fa facility..

I hope this helps.

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