Subtraction/ Score and Percentage. Help me out with this one please.

[Alexandro]

Hi everyone,

Are the following sentences correct? If not, then please do not hesitate to correct them, please.

- The teacher subtracted 1 mark for each wrong answer.
- The teacher subtracted 1 point for each wrong answer.
- The teacher subtracted 1 mark for a wong answer.
- The teacher subtracted 1 point for a wrong answer.

- He scored 95 out of (a) 100 on his English examination.
- How much per cent of our brains do we use?

Thanks
Alexandro
_________________
'Everyone can mistakes! After all, nobody's perfect.'

[Mister Micawber]

- The teacher subtracted 1 mark for each wrong answer.
- The teacher subtracted 1 point for each wrong answer.
- The teacher subtracted 1 mark for a wrong answer.
- The teacher subtracted 1 point for a wrong answer.
- He scored 95 out of a hundred / one hundred on his English examination.
- What per cent of our brains do we use?
_________________
Native English teacher at Mister Micawber's

[Alexandro]

Thanks MM.
_________________
'Everyone can mistakes! After all, nobody's perfect.'