Use a CRP-5. The price is equivalent to 15 minutes flying on an MEIR course, to make your exams somewhat easier and less stressful! On the other hand if you buy on e-bay or from someone in the school who has finished exams and doesn't need it for the flying, and then resell it afterwards, it can be very little cost at all.
The CRP-5 has 2 advantages: it is one of the 2 best-made flight computers I have come across, and I have had many including an alluminium E6B, and most importantly the exam answers are found on it by the examiners! There are slight differneces between the calibration of different instruments, so this is a real advantage in the exam. I believe that the new ARC-2 from AFE is more accurate (and cheaper, also the other of the 2 best-made) but that is irrelevant; you don't want the right answer, you want the answer the examiner got!
Send Clowns
Nav instructor
BCFT