Just posted this elsewhere, but:
For anyone who wants a reference point, here are my scores.
I studied about 180 hours total - about 20 before the first O'Sullivan's, about 70 between that and the first PEAT, and about 60 more between PEAT 1 and PEAT 2, and about 30 between PEAT 2 and the NPTE.
O'Sullivan's #1 (1/2017): 69.5%
PEAT 1 (3/2017): 623
O'Sullivan's #2 (3/2017): 70.5%
PEAT 2 (4/2017): 711
NPTE (4/2017): 755