We often see less experienced bands turn up to the studio not 100% prepared
A few simple things
Know your song and all the parts and ensure that you can play to a click track ..
Sounds Obvious ................
As expensive as it is; it makes as much of a difference as new guitar strings do
New is good. Unless you want that old punky vibez
Dark Cymbals for Studio
Bright cymbals are nice to play but in the studio often darker cymbals will cause less problems when its time to mix
How are the health of your amps tubes?