Checking/Ticking all the fields on a recommendation letter as "Exceptional"

My student has given me a recommendation letter form for the studies he is applying for, and the form has a part where I should simply "tick" the options. For example: Maturity, Motivation, etc. I can check these fields with "Exceptional", "Excellent", "Very Good", "Good", and so on...

When I think of it, I really want to tick all these fields as "Exceptional", because this student is my best student, he has been the top student in his class for all the courses I have taught and he is one of the best students I have known throughout the, at least, past 10 years. Do you believe that checking ALL the fields as "Exceptional" would look very bad to the admissions committee? I do not want to ruin his chances by my recommendation letter.