Translation:I am not an elementary school student.
The sentence is not talking about the existance of a student. It is talking about the relationship between "I" and "student." When talking about a relationship (or the state of myself) ある is always used, not いる, so positive is である/であります => short form だ/です respectively and negative is で(は)ない/で(は)ありません
I don't want to go this far but there seem to be people hanging around asking for more details, so below is an advanced topic..
ある has three meanings:
- As a normal verb, existance of an inanimate object.
- As an auxiliary verb, depending on the copula, it adds a state of some sense to the overall meaning. e.g. 書いてある has been written (the state of finished writing), 増えつつある is gradually increasing (describing the state of the increase), 学生である is a student (the state of being a student)
- As a prefix, あるX = a certain/some X,.e.g. ある人 some person
Actually in NZ there are two types of Primary School. I would say that MOST only go up to year 6, but some (with pressure from the govt) incorporate intermediate school years and go up to year 8. High School is always 5 years here. In between Primary and High School there is intermediate school which is two years (years 7 and 8). AND THEN.....there are some private schools that go from Primary School right through to the end of High School - and apparently here where I live in NZ there is at least one private High School that I think starts at year 8 and so is 6 years. You're probably all thoroughly confused now!
There is a google keyboard for Japanese in the google play which is quite good. You type the romaji of the word and it will show up the kanji/kana where you can choose how to display. I am using a sony phone and it is out of the box. By the way, there is a handwriting tool you can write the kanji if you don't know how to say it.