what is the roadmap to be software engineer after 10+2 examination?

Get into IIIT or some well known NIT opting CSE or IT
Or
Clear JEE ADV and get in IIT opting CSE or IT
Or
If you are not interested in B Tech go for BCA (Bangalore recommended)
Or
If you failed to do any of these Prepare for GATE and you will get a second to get into IITs or NITs