Chemistry and the history of nature are 5, as well as German and Italian, art drawing and geography are 4 and some "..drawing" I can't recognize. French 3.
Moreover as far as I see it's his final degree score of his whole secondary education (the last step before university).
http://en.wikipedia.org/wiki/Gymnasium_(school)#Final_degree
However, it is not so obvious that 6 is the highest score. While it was the case in Switzerland (where Einstein was studying at that age), it was the exact contrary in Germany at that time - 1 being the best score and 6 the lowest.
As pointed out in the Stack Exchange's answers, this discrepancy in scoring systems may also have contributed to the myth of Einstein's poor performance at school.
Wrong, in the certificate it's clearly written that he's born in 1879 and that the exams happened in 1896, as he was obviously 17. As I already claimed it is a "final degree" score before the university.
http://www.allaboutmovies.com.au/images/pictures/store/E/ein...
He is of course not implying that he is bad at math as many students believe, but rather that the math he had to cope with was much harder.