Gen nav is nothing else than being able to draw lines and a few formulae..if you dont get it..use the feedback exercises using the answers to understand the logic behind..it worked for me;-)
Instruments..you need to use the memory more...especially A/P stuff..Efis..
Once again use to feedback to check you understand what you are reading...
If a stupid french like me did it..you can too!!dont spend too much time behind the bar drawing though...theres always a good looking lady who also has problems with Gen Nav(who doesnt??)and whos waiting for private drawing classes;-)
All the best,
The worse is to come..
M.85