In case the driver does not understand English or Putonghua well, the page of Chinese texts may help. You may click and print it if needed.
Usually, the driver may not be familiar with the roads inside the campus. You may ask the guards at the entrance booth to direct the driver (again, the Chinese texts and the campus map may be useful).
This is indeed the best method in terms of money and time. It only
requires minimal experiences of travelling to manage it. The total
fare is HK$24.
If you are going to the guest house, you may get off also at the second stop and walk backward for 10 minutes. Or, if you have the help of a local person, you may take a 5-minute short cut from the first stop.