1. Start with the easiest clue anchors
In Kakegurui mode the series clue is already spent, so your first job is to separate 4 characters, all listed for 2017. Gender is a blunt tool here (every candidate is tagged female, so gender resolves nothing), and white hair appears on only 1 of them, while black covers 2.
2. Use contrast instead of repetition
Start from Kirari Momobami, then change axis instead of staying inside the same visual group: red eyes are the rarest tag at 1, and blue the most common at 2. Two guesses that share a hair colour burn a slot without narrowing anything.
3. Review the pool after each game
The overlap worth memorising is this: Kirari Momobami and Mary Saotome agree on 4 of the five clue traits. In a pool of 4, that single pair decides most failed runs, so learn how the two differ before the next daily puzzle.