Hello candidate,

Different colleges and institutes have different rules and follow different time tables for completion of their semester examinations, so it pretty much depends on the institute in which you have enrolled that whether they will take you to the third semester or directly to the fourth semester.

If the Institute classes are going on currently in the third semester, then its automatic that they will enroll you in the same class and you will have to give the third semester examination in order to get promoted to the 4th sem.

Hope it helps you.