Next Card Betting strips bet sizing down to its skeleton. Every card that has been dealt stays face up on the table, so the probability of each outcome is not something you estimate: it is something you can count exactly. That removes the guesswork and leaves one real decision behind, which is how much of your balance to put behind a bet you know the odds of.
That is deliberate. In an interview, a wrong probability and a wrong bet size look the same from the outside: both end in a bad number. This game separates them, so you can find out which of the two you are actually bad at. The sizing half is graded against the Kelly criterion, so read that lesson first if the formula is new to you.
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