Pick one and do it on deadlift day either sld or gms
On squat day just do some Glute Ham Raises if you dont have a machine do them ghetto style on the lat pull down (youtube) that<<
Regarding board presses theyre more for lockout strength which usually is not what a raw lifter has trouble with.
Add in some paused benches as assistance make sure to hit atleast 3 sets of 5 with atleast a 2 second pause.
Triceps- Dont go crazy here.. Do close grip bench-weighted dips-Do some skull crushers if you want to hell even do some pushdowns
Example Bench day- after your main sets reps...do close grip bench weighted tricep dips and pushdowns
On OHP day do the same but instead of push downs add skull crushers
Just dont go nuts and try to turn these into max effort lifts
3 sets of 10-12 is all you need they should be challenging but remember they are assistance