well, it may or may not relate to your majoring in business administration.
But if I were u, I'd start with some fundamental stuffs or familiar contents.
In short, I find ethics, quantitative and economics relatively independent in CFA readings, and financial reporting and corporate finance are kind of foundation of equity, credit, derivative and other investment analysis and maybe portfolio management, too.
So I'd suggest to start with financial reporting/analysis and corporate finance, and given you are BBA, those may look reminiscent and relatively easy to proceed for u. and do ethics, quantitative and economics whenever u feel suitable, although it's rumored that for L1, ethics is sorta important.