Really the wrong question. The answer is you are expected to perform at the same level as the past performance that allowed you to receive an appointment. Period.
Theoretically. If they want a class of 1132 and after offers/acceptances shake out they have a class of 1115 slated for IDay they "may" add from the WL until they reach 1132.
You will know company before IDay and all mail will go to a generic address for the detailers to sort and deliver (ex MIDN 4/C XXX Platoon A Company 2, 1 Wilson RD, Annapolis MD 21412). Toward the end of plebe summer they will be assigned a permanent mailbox so the address will change to (ex)...
Probably now board qualified but that does not mean you cannot be offered prep school or foundation. I have had candidates offered NAPs with a board qualification. That qual is not just academic-it includes character, leadership, etc.