Targeted practice usually beats random practice. Focus first on the operations that appear constantly in cases: percentage changes, multiplication shortcuts, division, weighted averages, and break-even style calculations.

You also want to practice saying the math out loud, not just solving silently. In interviews, speed and communication are linked.

Fifteen focused minutes a day is often better than one long session once a week.

Percentages and division were the biggest unlock for me.

I started doing 10 minutes every morning and it worked better than occasional big practice sessions.