Yes you can apply brother.

For reattempts into JEE makn, one can change his board , but you need to specify the board whike Jee makn registration for second attempt.

In our opinion, rather than changing baords you should give improvement exam for CBSE board itslef.

You can give improvement exams for subjects where you have scored less comparitvly.

You need to fulfill minimum 75% aggregate marks for Admission into NITs and IIITs.

Changing baords inolves lot of complexity and hassle.

Instead focus on subjects where you need sufficient marks for improvement exam in 2018 to qualify for premier Institution.

You can give exam for atleast one paper kr more than that as per your choices.
Shall you have more doubts feel free to revert back.

All very best for future endeavours...!!!

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