Hello,

The best way to find your unused tuition amounts is by logging in your CRA MyAccount. You can also review the prior year’s Notice of Assessment (NOA) that was sent in the mail if you like hardcopies.

Please also refer to the https://turbotax.intuit.ca/tips/how-to-claim-unused-tuition-and-education-tax-credits-16399#:~:text=...  for the detailed response.