How do I get a GT score waiver for Drill Sergeant school?

If you were DA select, it’s likely a waiver has already been processed as it’s your branch giving you up to be a DS

Your questions are answered. Now focus on your preparation. You didn’t ask but the greatest challenge NCOs face is fatigue, it leads to lapses in judgement/overall mental capacity. Fatigue can be mitigated through fitness. Be as for as you can heading to the Academy. When you go through the rigors of the drills and evaluations your fitness level will greatly increase your ability to work through the evaluation. Anyway, I am sure you knew this, just hitting it home as all to many NCOs feel they are fit for regular duty, they can handle the rigors of DI. I argue that it is not the case. The average NCO is not physically ready, which again leads to mental lapses that can result in failure.

As SSG (Join to see) stated, you've already been given the waiver. You need a 100 GT to volunteer for DS assignment. HRC placed you on the assignment, so HRC has already granted the waiver. In fact, if you were to look in the special instructions in EDAS it would say GT waiver has been approved