A sharpened chinagraph (spelling) pencil is more than adequate, requires non of the messing about (can just remove with finger)and is probably more accurate than most folks flying! The exam questions won't give options 2 degrees apart. The questions usually want to make sure that you are not confused about how to add wind and compensate for drift. The options will be very distinct.
Very very easy so long as you know how to use the CRP and cross-check your answer approximatey.