OAT Assesssment
I've successfully completed the OAT assessment.
Aswell as the things previosuly mentioned you also have a maths test, physics test and a personality test. (whereby u answer 200 questions). I personally found the Compass tests (computer based ones) the hardest.
One piece of advice - answer honestly for the peronality test - what u think may be the correct answer isn't necessarily what the assessors are looking for!