Hey Aspirant!!

Whenever it comes to appearing in re-test it totally depends on the Institution where you are pursuing your education. Since you are about to appear in the Re-Test, most often for genuine colleges they don't ask the students to repeat the entire year, and on the basis of the Score of the retest they promote the students to the upcoming class. But yes following the rule of your institution the decision will be made by the authority.

Hope it helps!!!!