Realistically, how much of financial accounting do I need for IB?

I'm in fin acc rn, and while the questions are easy to do one-by-one, there's SOOOOOOOOOOOOOO much information and various concepts that I don't even know if the professor memorized all of them (e.g formulas, principles, etc.). I learn a random new fact beyond the notes packet EVERY time I do a homework question, so what I really need for IB? Do I need niche stuff like double-entry accounting, inventory equations (e.g LIFO/FIFO, COGS typa stuff), perpetual inventory method, etc for IB, or do I just need to know how to construct a basic LBO and DCF?

Also, when ppl talk about "modeling," I assume that it's making a DCF on Excel right and NOT on paper right? Or is that more statistics?

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