Re: Student ability
If you have any times where he can have an open practice session, maybe have him start preparing and practicing for his next test. My sensei says that people who want to test and prepare for testing usually end up having better Aikido than people who never bother testing. I have found for me, in my short Aikido career, that it helps to practice the syllabus material during an open class and it helps me solidify the techniques in my mind. I know you only have classes a couple of times a week, but maybe if he gets an experienced uke to work with it will help.