The first exam had a mean of about 75. If you in the neighborhood of a 75 on the exam, you don't have much to worry about. If you were well above a 75, you should feel pretty good about your performance. If you were well below a 75, then you will need to bring up your performance on the remaining three exams.
If it says ABS next to your SSN, then you have an excused absence for the exam. If it does not say ABS, and you have no score, then it means I do not currently have an excused absence for you and you did not take the exam.