My opinion is to give Physio 6 days of your study time...
1 day BRS Physio CV
1 day BRS Physio Respiratory
1 day BRS Physio Renal
1 day BRS Physio GI
1 day BRS Physio Endocrine
(all the above early...I did them first)
1 day FA Physio
(do this in the last week before the exam)
This is just one idea, I'm sure there are many others. However, after doing so I've been rocking my Qbank physio mcqs, and in depth knowledge of physio has allowed me to "reason" some pathophys/pathology/pharm stuff out that I might not have otherwise committed to memory. Best of luck!
It all depends on whether or not you are strong in physio to begin with. If physio is one of your better subjects, there is no need to read brs. Spend more time on the subjects that you have trouble with. If physio is one of them...then read brs.
To answer some of the questions, you're going to need the detail offered in BRS, as opposed to FA. May sure you pay close attention to all the graphs too.