You will be fine , especially if your maths is up to speed you wont have a problem .
If you get stuck on anything just e-mail alax ( the owner of bgs ) or any of his instructors ( who are all excellent ) and you will get great support via e-mail , or just call them on the phone and they will explain to the best of their ability .
I found bgs great and much prefered the distant learning package , I was able to learn it at my own pace and get help when I needed it .
Goodluck with whatever you decide ... flighttime...