Yes, but I'm lazy. The same thing happened when I went after my professional certification as a Registered Parliamentarian. I passed 3 of the 5 sections and could have gone back and retaken just the two I didn't pass, but I put it off so long that they changed the system entirely so I'd have to start all over again, whereas if I'd done it promptly, I could have tagged RP after my name forever as long I kept paying my membership dues.