I began smoking in eleventh grade, also the year I drank numerous bottles of terrible sweet, very cheap wine.

我在上11年级的时候开始抽烟，也是在那一年我喝了很多瓶很甜、很便宜的葡萄酒。

I have to take four make-up exams or they're gonna make me repeat eleventh grade.

我得参加四门补考不然就要留级重读高二。

Now, this is a little different from a similar term, " class president." Each level in a high school (that is, in a typical high school), a ninth grade, tenth grade, eleventh grade, and twelfth grade – those are the four levels.

现在，这与类似的术语“班长”有点不同。高中（也就是典型的高中）的每个level，九年级，十年级，十一年级，十二年级，就是四个level。