Hey ismo, I done the numerical and group exercise a while ago but from what i remember the numerical was a bit tough, you have 16 questions and 20 mins to answer them (without a calculator). As for the group exercise they told us to firstly individually come up with and internet based business plan in 2 minutes i.e. to come up with an idea for a business that is based on the internet e.g. social media, buying selling online ect. Then we had to do a short presentation (1-2 minutes) on our plan. After that we had to decide as a group which ouf our business plans is the best and then after 20minutes of discussion we had to as a group present this idea/plan in more detail to a panel.
That was pretty much it for the day, it took around 2 hours to finish the numerical and group excercise. btw be prepared to be asked why you applied for the role and why management solutions, the HR lady told us to to initially introduce our selves and asked us those two questions.
All the best mate