Dun feel worried...it's MMI and wasn't as stressful as you think.
The maths was quite hard under the time condition , but please do remember it's MMI and everyone would be on the same boat- and everything should have been changed by now.Therefore, if you think you didn't do well on one station , it doesn't really matter and focus on the next one.
The main thing is keep calm and breath ...you need understand 2 principles : it's they want you and they want you very much...
Because they are only interviewing 32 this time , if the intake is 15 there will be more than 15 offers...
Be positive and stop worrying...