Accounting / Valuation

Hey all,

Non-finance major entering IB soon. Was wondering how to best self-teach myself accounting, Excel, and PowerPoint? I have never taken any formal classes and have access to WSP, etc. but want to learn at a deeper level so I can hit the ground running. That means things like if my MD / VP says "let's create these slides from outline -> deck, I can start getting on the content ASAP rather than spending time worrying about the layout or how exactly to build the layout). Maybe it's more of a skills thing than anyhting else and I want to improve on it before starting FT>

Thank you!