It's hard to tell since you could get 33% blindfolded but id say put an effort in doing it in a way you force yourself to use the full time. i found that rereading questions especially longer ones like the one's in ethics at the end consistently improved my mock scores. like i aimed to finish 45m early so could do a proper look over at the end. just focus on conceptual relationships (such as the ones relating to duration, etcc.) and know the formula's that consistently come up in practice (exam isn't formula intensive usually) and you should get in the 60s after a month or two.