Hi.

No you do not need to give CAT Exam for admission into UG Courses in a government college.

The Common Admission Test is a computer based test for admission in a graduate management program.

The entrance exam for govt. colleges depends upon the course you wish to get enrolled into, such as, if you want to pursue engineering then you need give JEE Mains exam, if you want to pursue medical sciences then you need give NEET Exam and so on.

If you have a further specific query please feel free to comment.

Best of Luck.