M.Tech. in Irrigation and Drainage Engineering 

at College of Agricultural Engineering and Post Harvest Technology, Gangtok

BTech courses do offer a variety of electives for you to opt for in the 5th and 6th semesters, where you get the chance to pick a specific subject that interests you more and is easy-going for you. 
You can choose to pick a subject according to the specialised field within your broad BTech specialization, which you would like to enter into in the future, where you see yourself as a happy and well-established engineering professional. For example, in BTech Electrical Engineering, there are a variety of electives like Power Systems and Electronics, Signal Processing, Communication Systems Theory, VLSI Technology, etc.

The MTech syllabus is not similar in all the Indian colleges. Talking about the first year of MTech, the general subjects taught are in line with the specialisation chosen by you in order to provide you with the foundational research knowledge of the subject area. Further, the M.Tech syllabus will differ on the basis of the specialisation you have chosen and the institution offering the M.Tech course, different colleges follow their own set of guidelines regarding the M.Tech course curriculum that includes both core and elective subjects along with project work in the last semester.