No, He will not face any issue. Jadavpur University is one of the best university present and very good coding enviorment is there.

Even if he doesn't get selected into CS and do the Hardwork there too, He still can crack good companies as many companies allow other branches students to sit in the Placements and if his coding skills will be good, he even can apply Off Campus. Then Branch will not matter at all.

I hope I have cleared your doubt.

ALL THE BEST :)