I often show my lack of confidence in his abilities , his luck, his future progress, ,, it would affect him.

for math, More nurturing less demanding; instead of telling him what to do, suggest to him.

Rebuild his self-esteem and confidence in math.

He doesn’t show all his cards. He may have some special skills; he may feel ashamed sometimes.

Get boy to finish the toughest homework early, before dinner, to fend off the fearful math teacher.

Consider stopping the Science/Eng tuition. It is counter-productive to developing his motivation and self responsibility.