You do not have a make a reservation to retake a test if you come on Monday afternoons at 1:00.  Just walk in and give the teacher the corrections assignment stapled on top of the original test, and then you can retake the test at that time.  
YES,  you must make a reservation for any of the available mid-week retake test times (go to the Math RETAKE TEST Days and Times link that's on the main math webpage to see those mid-week test times). That's because there are only a few spots open, and the teacher must have enough advanced notice to prepare a test and have it ready in place because the test will taken in the back of the classroom while a class is being conducted. 
HERE'S HOW TO MAKE THE RESERVATIONS for retake tests that are during the week (the ones that are in the back of the classroom during a study group):
1.  Send an email to me (Mr. Greenwood) before 3:05 on Monday afternoon of the week to take the test.  
2.  Write in the email the following things:
(1) student name,
(2) course name, 
(3) test month/number,
(4) requested day,
(5) requested time.
3.  Get an email back from me confirming that the time is reserved for you (or your child, for younger students).   Notice that emailing to me is not enough; if you do not get an email confirmation back from me, then you do NOT have the spot reserved.  Email me again if you have not heard back after one school day. 
4.  If you come to the classroom to make the reservation in person, you must see me write it down on my retake schedule--or else it is NOT confirmed.

Remember, you don't have to make a reservation for the Monday 1:00 retake testing times.  For those, students just have to show up with the corrections assignment stapled to the original test.