Hello.
1) Grammar school - this will depend on the country you are applying to. In the UK, for example, a grammar school is a publicly funded school for which there is a competitive examination for entrance at age 11. Only a few children take the tests though, and out of those, only a few pass.
2) Stick to touch typing.
3) Well what was your job? There is nothing wrong with secretary but if you want to make it sound a bit more exciting you could say P.A.