I had a fairly simple video interview followed by an assessment day. Assessment day consists of 3 face to face interviews and tests in IT aptitude,venn diagrams and math. Interviews were scripted and not personal, tests were all fairly simple.

3 test and 2 interview sessions in a span off 4 hours IT aptitude test with 50 questions, really hard but you don't have to score very well to pass it. Math test - just make sure you can do multiplication and division on large numbers Venn Diagram - really simple if you understand the concept. a help book is provided