Get to FSP, and work your arse off. You will get the result you were after.
I'm sure FSP has changed even in the two years since I did it, but I'm sure the common formula hasn't. Put in the hard yards while at Tamworth, I'm sure you will reap the reward.
As far as Mass Briefs go, the time you get given to learn the material is pretty adequate, certainly most of my friends and myself managed fine.
And I don't think the MB's are on DRN either. As someone above said, it is a Bae thing. BFTS SATG and Type Manuals etc are on their, but that is of bugger all use on FSP.