There are various branches in B.Tech Engineering course after completion of class XII. The top courses which can be carried out in B.Tech is as follows....

Electronics and Communication Engineering
Mechanical Engineering
Aeronautical Engineering
Civil Engineering
Bio - Informatics
Electrical and Electronics Engineering
Computer Science and Engineering
Biotechnology
Food Processing

I will advise you to try to choose the branch in which you are really interested. If you study in dept with real zeal and interest in your field , the career opportunities will be amazing irrespective of the department.