Photosphere
Honestly.... even if mc didnt go to school in his first life and relied on luck for everything... maybe thats ok for him being so ignorant that he cannot do 8-2=6 correctly.... but his second life he did go to school and even if he is as stupid as a money and skipped half his classes. He should be able to do the 4 aritmetic basics... you try to make a comedy out of this but it fails in every way possible. Its not funny at all... maybe if the background of mc was a jungle kid or something that hasnt read a book even once...
Also author... you are condracitcing yourself... if mc cannot do even addition correctly. How he can know that he needs to kill 100.000 zombies to get 1 million points? He cannot do 4x5 correctly, cannot do 8-6 correctly but he can multiply 6 digit numbers ??? This is the problem where you try to make make a smart mc thats also stupid. You get contradictions... mc should have failed to even graduate from elementary school, much less reaching middle school and impossible to reach highschool... If you want a protagonist who cannot do basic math... he CANNOT be a student in highschool... maybe if mc was an elementary school drop out or something. There is no justifocation or excuses for this mess