Hey Reeta,

Thanks for reaching out!

you've already taken admission in Msc.CS but now you want to shift for MCA. If you've filled the PSR(Provisional Seat Report),your seat is officially locked,and course change is usually not allowed However,In some cases,If the college or university allows internal changes by submitting a formal request to the admission office or University registrar .It depends on their rules and timings.So, approach them as soon as possible.

Early action is important .