And on English, I met a Singaporean, about 25 years old, who had only learnt English in the last two years. His speech was idiomatically perfect and accentless and his writing to the same standard.
Karson, you might look in the OASC sticky at the top, possibly the RAAF one and then the UK Student Room. I believe they all refer to different revision aids.
On self-help, do you have any voluntary first aider courses that you could join? On maths brush up on time, speed, distance calculations. You can concentrate on helicopter speeds and probable distances for your local area. Simple 60 kts equals mile a minute, Distance covered in six minutes is one tenth of groundspeed. 90 kts = 9 miles = 6 minutes etc. Perhaps study local topography so you would be familiar with the area.