How should you design your drills? That depends on the area you want to drill. Can it be easily isolated from the rest of your project? If so, try time-slicing, where you isolate one step in a more involved process and repeat the step until you’ve perfected it.

For example, you may have a great grasp of the principles of accounting theory, but lack the Excel expertise to put these principles into practice. In that case, learning Excel would be your rate-determining step, so you’d focus your drilling in this area.