Send me a PM with your email address and I will send you what I have from 5 years ago.
Basically you have to 'unlearn' air law as you know it and 'relearn' air law as it was in the 1950's. A number of the questions in the NCAA 1950's database have the wrong answers, and you have to know the wrong answers in order to pass the exam. The NCAA have been told about this so many times.
When you come to fly here in Nigeria you will learn all the procedural stuff that was used in the 1950's. In those days of course aircraft movements were few and far between - and the aircraft speeds were 250 kts, not 450 kts.
Nigerian airspace is mayhem at the busy times.
You really sure you want to learn Nigerian air law?