You can apply with a 2.2 in any subject. The online assessment are very different to any other I've taken. If you have taken the tesco assessments, its really similar to that. The numerical assessment was timed, 36 minutes to do around 30 questions I think. Make sure you do the practice test beforehand.

First stage is an online assessment where you rank some statements in order of preference. Second stage includes a video interview, more statements for you to rank and some scenario questions relevant to the stream you apply for.