May I schedule a drivers license road test for Chol Hamoed?
If you need it in order to drive on Chol Hamoed, this would be permitted. If it is not for driving on Chol Hamoed, but it would cause you a loss to do it any other time [i.e. there are no available appointments for a long time and you need the license for work or school] this would be a davar haved [a case of loss] and permitted.
However if it is just convenient and could be done another time, it should not be done on Chol Hamoed, as with all activity and specifically melacha that is not for Yom Tov needs.
See Shu”t Beer Moshe Vol. 7:13,99