Most credit cards explicitly exclude any earning of points or miles for payments to educational institutions. After all, such fees are usually hefty, and banks will have to award customers too many miles if this category of spend were to be allowed for accrual of miles.
For a limited time only, OCBC Voyage cardholders will be able to earn miles for payments to educational institutions. Specifically, from now until 28 Feb 2022, such transactions will earn you 0.5 mpd, which is much better than not earning any miles at all.
Under this promotion, the payments must be made under the merchant category code (MCC) of 8220 (Colleges, Universities, Professional Schools and Junior Colleges). The transaction must also be made in foreign currency.
Miles earned during the promotion will be credited within 2 months after the end of the promotion period.
Given that payments to educational institutions are usually excluded from earning points and miles, this promotion would be great if you have any of such payments to be made in the near future.
The full terms and conditions of the promotion can be found here.