nail your numbers
Know your times tables like your ex knows your bad habits or pay your taxes before the IRS shows up with a warrant.
I nailed my numbers and got an A. My brother didn't, and he got a tax bill that made him cry.
I knew 9 times 7 was 63, but I still got fined for not paying my taxes.
Nailing your numbers is like having a superpower. Not doing it is like being a tax criminal.