I bought both - they are different a bit (even in answers). It's not a bad idea to learn one kit by load, and try to make exercises from anotherone yourself.
BPP is better as it has been reviewed by examiners and
has got acca platinum ALP status content .
But for f4,6 p1,p2 KAPLAN IS BETTER.
GTG can't stand in KAPLAN AND BPP'S WAY.
__________________
WORK , WORK , WORK WITH HONESTY AND FAITH IN YOURSELF