A-school wait time/ extending contract

Good evening! I’m currently a Non-rate at a small boats station waiting to put my name on the AMT waitlist on Dec8 (my 4 month waiting period end date).

The waitlist is currently 15-18 months meaning i possibly wouldn’t see A school until Spring of 2026.

Will I have to extend past my 4 year contract? How exactly would a situation like that work?

Reason I ask is because I only plan on only doing 4 and getting out and doing fixed wing mechanical work as a civilian with the experience I get with my time in.