Hi Medgar,
Best of luck for tomorrow! You can't use a calculator in the tests so don't worry about taking one with you.
Go in with an open mind and just relax...they're multiple choice so you won't have to explain anything (just yet!) and so long as you've learnt your stuff, you'll be fine.
You can PM me if you have any other questions if you like...I'm online for a bit.
Cjayne