一句：feelings…… build and build,前面是原因：since it's not you,
who is doing so well,posting remarkable grades and completing schoolwork with such ease这一句,是you的从句,说明you的特点.
整个是说如果能像这个人那样,就挺高尚的了,否则,一个正常人,看到你那么厉害,一定会越来越妒嫉.posting remarkable grades and completing schoolwork with such ease ,feelings of anger这些是状语吗is doing...posting...and completing...应该是并列的关系吧。