F1 – Bpp or Kaplan

Hi. My exam is next thursday. and here is the problem:

i have been using the kaplan text.

when i do problems from the kaplan kit, i get good scores.

but if i do questions from bpp kit, my scores fall to 60%.

this has me really worried.

is kaplan not as good as bpp or bpp is just too hard or shd i hav used bpp??????????

if the scores on the kaplan kit are not indicative, what can i do in such a short period?????????????

thanks in advance