Haha, don't stress out...
Just try and pass (like answer about 2/3 to 3/4 of the exam)...and you'll probably get a credit.
I think 1151 will get scaled (somewhere on the maths website, it says there are more Ds and HDs given out compared to 1131/1141) :uhhuh:
Get good night sleep, and memorise more of the algebra stuff; its way simpler than calculus, IMHO, especially knowing the theorems, riemann sums and errors from quadrature.
Good Luck!