To add further to the already excellent contributions. Don't dick about in Ground school during primary. Don't dick about in API and fail. There is zero reason to let one (or two) of your three strikes be for basically quite easy exams in API and ground school. I've already seen a few IPCs and FPCs resulting from people rolling into ground school with 1 API failure, failing an exam in ground school, and then failing a flight. Take it seriously and finish API and ground school with your academic record intact. Chances are that you will foul something up at some point and there is no point having already used up one or two of your get out of jail free cards for that.