There isn't much maths involvedin the PPL. The majority is just arithmetic so make sure you can add, subtract,multiply and divide quickly. This is especially important in the Nav exercisesas you will have to give an ETA and then when making a diversion you will needto calculate the heading, speed, distance, time without using a flight computer. It's not difficultbut does require some basic maths.
The only other things which aremaths related in the PPL written exams are: You will need to know that anincrease in load factor (lf) = an increase in stall speed. The equation iswritten like = VsoGx= √LF this just means that your stall speed will increaseby the percentage of the square root of the load factor so Vso2G = √2 = 1.44 sothe stall speed at 2G will increase by 44%. That's probably the most difficultmaths you will use at PPL level.
Other equations you may be taughtare: G force experienced = 1/cosa when a=bank angle. So in a 60 degree turn youwill experience 1/cos(60)= 2G.
Hope this helps but don't be tooworried about the last two formulae as you will get taught this in much moredetail in the PPL ground School.
The CRP/5 which is what you need costs around £35 if you plan on doing cpl you will need the crp/1 which is around £55 , check ebay athough cpl students snap em up .
It's the other way around: CRP/1 is for the PPL and CRP/5 is for the ATPL/CPL.