In my opinion, much as having knowledge about every topic is paramount for F7; Perfecting CONSOLIDATION, Published A/cs, ratio Analysis and having solid knowledge on the theory discursive aspects of the exam (IFRS & IAS's) gives you a higher chance of hitting the pass mark.
concentrate both on the numerical and discursive aspects. most of the time we concentrate on the former and ignore the latter which if given attention could earn one a decisive mark.
I am not sure whether CBE for F7 is available, but the two main topics are Consolidation and Published Accounts, not forgetting the ratios and interpretation.
CBEs are only available for the F1, F2, F3 and F4 (English and Global) exams of the ACCA Qualification.
There is no CBE for F7. Doing selective study is not advisable for the ACCA exams. The exams cover all topics.