Thanks for everyone!
The preposition would be "to", not "for".
My scores was about 4-5...
Although both terms "grades" and "scores" are used in reference to the studying performance of a student, they have a slightly different meaning and usage. The score is usually the result of a test, while common everyday marks are called grades, which is just the case here. Also, the verb should be in plural.
But ten years without any practise...
practi
ce, noun (but americans may disagree)
...Moderators are object against this theme.
The "are" is to be omitted, "object to/against" is a verb on its own.
I am terribly sorry if I do not fit into the discussion, I just thought I might be of help here. It's literally the only topic in this forum where I happen to be sort of a competent participant.
I would recommend
http://www.wordreference.com/ as a source of information and a place to discuss anything regarding languages. Do check it out, it has several forums!