The interview process could be considered a long winded one, but that is because Pollen's client's have very high expectations.
GIA: This is very important to Pollen as it tests accuracy and speed, it is designed well to mirror the situation of people put on a new project with a new client. AKA ability to handle and process a lot of new information. If you cannot pass this (85%) then it is company policy to not take the recruitment process any further.
Business Case: This involves 3 client scenario questions around logic, advanced maths but mostly common sense. As with the GIA, if you do not excel in this, there is no point taking the interview process any further.