Your price is not an issue. You need to deliver more value. Try anchoring. E.g. cost of attending uni for an extra year because you failed chemistry, vs cost of

Your price is not an issue. You need to deliver more value. Try anchoring. E.g. cost of attending uni for an extra year because you failed chemistry, vs cost of notes. Explain the virtue of having so few pages. 29 pages vs 400 pages on textbook. You need to claim expertise. Why your notes are better than professors'. Perhaps it is because you tutor, and that keeps you in touch with what topics students have the most difficulty with. Maybe it is the way it is arranged for easy revision. You need to show it. Email them a sample page. It'll be less risky.