As you already know, the AR1 standardized final test will be held on Thursday, July 23. The classroom to which you have to go is already announced (See here).
In case you cannot take the test, you should submit an absence form. The absence policy is the same as that for the standardized tests you took in the first year. The absence form is here, and should be submitted by July 31, 5 pm. Notice that NOT all submitted absence forms will be accepted; you need to have a valid reason to be absent in the AR1 final test.