I am btech 1st year ,can I give ts EAMCET again , because i want to change my college

Minimum criteria to give the EAMCET exam is that you have to pass the 12th level of exam. For engineering courses, a students have to clear the exam (along with optional subject) that is conducted by Andhra Pradesh board of intermediate education.
Students who have a diploma can also apply for EAMCET if and only if the candidate has a minimum age of 16 as of 31st December of the admission year.
Hope this helps