The best thing is now not focus on the exams you struggled with, and know that you can make it up by focusing on your next exams, it all depends on what you get at the end as to whether you should retake, if you're not happy with what you got and you know you can do better then it might be an idea to retake however if you look at the exam a D k ow you did your best and it still wasn't very good the I'd focus on the exams you are doing best in x