Passed my Aerodynamics Exam with 85% Bob Taits book helped heaps with preperation. My advise is know your curves. Power, thrust, lift/drag ratio curve, coefficient of lift curve etc. Also the stabilities of longitudinal dihedral, longitudinal, directional and lateral stabiliies.

Congratulations and that's a very respectable mark as well - especially for home study. All the best with the rest of your training.

Bob