Hi,

Polytechnic is a 3-year diploma course that gives you hands-on technical experience. Once you finish the polytechnic course, you can apply for admission into Btech 2nd year or directly to jobs. However, you cannot apply for a lot of government exams using the Polytechnic qualification.

Read the article linked here for more information regarding Polytechnic courses - https://engineering.careers360.com/articles/polytechnic