Hello Subhash 

Obviously jee mains if you are looking for 1 year term.

Otherwise both are better in its own terms ; both will provide you ample of opportunity but it depends upon you and your interest . So what ever you choose do it with your full dedication and commitment.

Jee mains leads you to towards engineering ; research ; further studies ( Mtech ; MBA ; msc etc ) and provide you technical and scientific knowledge etc while ca leads you toward business skills ; management skills ; tax knowledge ; economic knowledge etc.

So choose wisely with full research .

Good luck