Had him as form tutor for 2 years. One of the nicest if not the nicest teacher at OPGS. I have no doubt he is very knowledgeable on the subject of mathematics and related subjects but he cannot teach I'm sorry. However, if you do ask for help you do get it, but it's just something you have to learn with Wallis. Learn to work with him. Apart from his teaching skills I think he's a brilliant individual and was proud to be his student.
He is kind, and caring, but can't teach! Famous catchphrases: 'umm boys, theres far too much noise'. 'Get ouuutttttt'!! Wwe love him though