Do the work. That’s all the productivity advice you need, and the only useful productivity advice you’re ever going to get. You can direct your attention to a million optimizations— email, meetings, notes, calendar, time tracking, goals, todo lists, time estimates, prioritization frameworks, quantified self sensors, analytics, apps, documents, journaling. But don’t. Ignore all this, and do the work. When you do the work, everything else optimizes itself.
Work means sitting down, getting through that calculus chapter, and doing the exercises. No amount of productivity hacking will make that easier. You don’t need pomodoro alarms, bullet journals, time tracking apps, animated explainer videos, or different color highlighters. Everyone doesn’t learn differently. Everyone learns calculus in the same way— by doing the work. You need Rudin’s book, a pen, paper, and time. More tools give you negative utility. They won’t make the work go faster. But they will consume as much time as you are willing to waste.