Yes you can drop your degree college as per your wish and reappear for entrance exam like JEE CET or comedk to pursue your career in engineering or if it is your last year then complete your degree and go for further studies in post graduate program like m.tech m.e if you meet eligibility criteria.

Also you can consider diploma degrees which is shorter than regular b.tech and lead to a career in engineering.

There are some colleges which provides lateral entry in second year directly if you come from same stream like Diploma in engineering or relevant discipline.