Whatever tuition is for, start it early, and spread it evenly over the time available. Done that way, tuition provides most benefit to the student.

For example, suppose a student needs 10 hours of tuition to prepare for an exam. All 10 hours could be on the day before the exam, or they could be one hour each week for the 10 weeks before the exam. The second alternative is far better. There is time for ideas to sink in, and time to return to troublesome ideas. Nor would losing a tuition session through illness be a disaster. If necessary, another session or an extra session can nearly always be fitted in.