When to fail?

[Robbie]

Hi Scott, whilst getting to grips with exercises and weights with the program, is it acceptable/a good idea to do extra reps when the weight has been set too low?

For example if I did 12 reps on a last set of compound exercise on a load set but have more in the tank - would it be best to take it to failure and then adjust weight next time?

Same with the pump sets, if Im at 25 reps, pumped but can still get another 5+ half reps out?

I see that it is addressed in the muscle round weight examples where the 6th set has 8 reps but couldn't see it elsewhere.

Thanks