Combining f3 with either f6 or f7

Hello Sir,

I’ve just completed studying for F3 with OT which you have prepared a remarkable framework for. however, as I am currently in the practice phase I was considering either studying for F6 or F7. Can you recommend me which paper would be more suitable to study for the September session and won’t interfere or muddle up my current F3 studies (which will be attempted via CBE). Also I wish to pass either paper in September well.

Many thanks,
Mij