Can I take direct entry into 2nd year of B.Tech after 12th from science stream? If yes, can you tell me the process?

I am sorry JS but I don't think there is any such provision of getting a direct entry to 2nd year directly after 10+2. You have to pursue from the very beginning i.e. from the 1st year. But if by any means you are not able to pursue B.Tech, then you can pursue a Diploma in the related stream and the

No, you can't take direct admission in 2nd year in any professional course according to the legal and actual procedure. There are some colleges and councilor do it by donation but that will be harmful for your career and knowledge both.