I did my mcc in a 737-200 and found it a massive jump going from a DA42 into a jet....
I was told on my course it would have been a good idea to read 'Handling the big jets'. I have since read it and I think it would have helped so if your doing your mcc in a jet you can only gain by having a read.
Again I'm sure all the courses differ slightly but we had a fair bit of performance stuff in the ground school. Wouldn't hurt to brush up on performance especially performance cat A.
Enjoy the course its a good insight into would could have been if it wasn't for this bloody recession!!!!