Buy online course be better at interviews

Hello monkeys,

This blog has been greatly helpful for me throughout my time trying to break into IBD. I will disclose my situation by saying that I am interning at a coverage group and I'd like to move on to M&A. I previously purchased Wall Street Prep crash course in Accounting and I learned lots of stuff from it. I come from a background where I did not receive any training in corporate finance. I was wondering if, in order to gain an edge in interviews I should buy the full package from wall street prep. I am asking this because given my situation it'd be a serious money commitment from my side and I would like to be absolutely sure.

Also due to time constraints, I'd prefer to be directed in my learning rather than trying to find answers scattered all around the internet.