CMB is special medical test conducted by PAF. Its held in Masroor Air Force Base Karachi. Air force has a hospital in the base where almost 3 to 4 days (working days) are spent by the candidates.
Upon reaching there you have to fill a few forms. There is a mess there for you. Here is the sequence of tests for GDP (they may very a bit, and for CAE and Non GD groups the tests might be a bit less tough and less in number)
1. Blood and urine test.
2. X Ray for chest.
3. ENT (Ear, DNS) Checkup by doctor
4. A test for ears in which they place a headphone on your ears and tell u that if u hear a beep in left or right ear then press respective button on a small panel.
4. Physical Exam (Height, weight, Chest measurements)
5. Surgical Exam
6. ECG
7. Heart beat Checkup by doctor
8. Then many tests of Eyes (ranging from Color blindness to check if there is any disease) Quite hectic and time consuming tests.
(I hope i havent missed anything). When you clear your CMB, you then go for Flying Aptitude test. It used to be in PAF selection center Karachi, but now it has been shifted to PAF selection center Rawalpindi.
Details of Flying aptitude test will be provided later.