As you want to get the details of subject which must be choosen to become a Software Engineer so here is the information of the same for you:

You should prefer taking Computer science along with Physics Chemistry and Maths in 11th and 12th standard.

If you have computer in 9th and 10th also it is very good.

You should study and understand computer well in order to be a good software engineer if you have decided so which is good.

It will be a plus point over others if you have studied some programming language before you join B.Tech.

It is very helpful later and you can always build on the existing knowledge.