Should we use our kids CDA or our bank accounts for their preschool (toddler, pg, K1, K2) fees and visits to the doctor in view of CDA having higher interest rates compared to a normal bank account?

CDA only can be used for kids purpose, in another words it's not fully liquid.
The 2% interest is slightly higher than other high yielding saving account (UOB one 1.85%), but not justifiable for me to keep too much money inside CDA.