If I had to recommend anything I’d say have a CFI legitimately just have you drill climbs/descents/level speed changes/turns/landing pattern. You wouldn’t believe how helpful understanding the relationship between power and airspeed is especially being able to perform those transitions without thinking. Once you’re a few weeks out from starting ground school I’d also start signing up for OFTs with people who have flown in the T-6. DRILL the landing pattern. In the early blocks the landing pattern is 4 graded items in each event. If you’re slamming 4s when MIF is a 2, you’ll have no problem getting jet grades. And don’t worry about the certificates/ratings at all, once flight training is done you’ll be able to snag a commercial rating.