MSBSHSE

After class 12th, you can choose to continue in your existing stream in 2 ways -
1) Traditional courses like B.Sc. Etc.
2). Professional courses like B.A. B.Sc. IT etc. Or change stream
1) traditional courses like B.A. B.Com
2) Professional courses like B.A. LL.B. You can plan to continue with computer science by studying courses like B.Sc. CS IT, B.Tech, B.A.

Yes this will create problem in admission. But if the other contents of uploaded marksheet are correct with respect to board's marksheet than the issue can be resolved during the counselling.

Hello Kanak, it's very nice to hear from you that you are intending to do doctorate in aerospace engineering. However aerospace engineering is an omnibus subject and it encompasses to many issues and areas. In addition for doing a doctor if one needs to option the Masters degree which apparently you have not here joined. But then you can do doctorate in one of the specialisations of physics which would be of use in aeronautical sciences. I would advise you to look for a guide and an institution who is offering this doctor air and after talking to them you can decide your next course of action. Best wishes to you.