Hi there,
I did Level 2 this past year and found it quite a jump initially, especially with the plant classification bits to begin with as all 'new' to me. However, did find going through that things would start to sink in and make sense. Especially useful I found was dipping in to different books - I would come home laden each week with a new selection from the college library - just to look up different bits, not to plough through.
The 'course book' - the big red one, I forget its title - is a good backbone, It's expensive new but our library had several copies.
Pleased to say I passed all modules (some commendations!), bit disappointed didn't do better on veggie production module though....only a pass - too complacent I guess :-\
Stick with it! Good luck.