$1)$ You must use R registers like $\%$rax, except for byte registers where needed.

$2)$ You must not use suffix $($q$,$l$,$w$,$b$)$ with assembly commands for easy reading.

Please indent the code and try to follow the pattern given as under:

Start: $($labels no indent.$)$

mov $$9,\%$rax $($a $=9)$ # $8$ spaces indent the line.

mov $$99,\%$rbx $($total $=99)$ show assignments.

LabelA:

cmp $$99,\%$rax