I’ve took one in this past semester and got a lot out of it.
我在学期末拿了第一,并从中收获了很多快乐.
got a lot out of it ：从中得到很多快乐
This should up to be a pretty good semester for you.
这个学期总体上是相当好的.
up to be：总的来说
I have to take one more Math course,but I have been putting it at all.
我不得不多上一门数学课程,但是我已经把它忘得一干二净.
这句中的putting it at all.忘得一干二净
but you may want to take it and just take these 4 courses in this semester
但是你或许想上这门课,而且在这个学期只想上这四门课.