In french its: 6eme classe, 7eme classe, 8eme classe, 9eme classe, 10eme classe, 11eme grade, 12eme classe. (or grade for all but that's more slang.) for the actual words its six,sept, huit, neuf,...
No. When you fail a grade that means you didn't learn what you needed so that also means you can't go on to the next. The only time in my 28 years of teaching I recommended a student move to the next...
In Spanish ''your in 6th grade 7th grade 8th grade 9th grade 10th grade 11th grade and 12th grade'' is "en su sexto séptimo grado grado 9 ° grado octavo grado 10 grado 11 grado grado y 12"
What you need to do is practice whatever you're practicing. If you think you have memorized it, have someone at home test you.But usually, just write it down 3 times each and say it three times each....