I was 63% too - I was diagnosed with it several years ago based on a lot of symptoms which are NOT in the quiz, plus positive blood tests on almost every factor listed

By the way, only something like 40% of people with Lupus end up with the rash, so that's not necessarily a good indicator.
Judging by what I have learned over the years, I'd say that quiz leaves a lot to be desired in terms of phrasing of questions and updated information on how the disease works.
Lupus is a chameleon and looks very different in different people. Also, if you don't catch it until all or most of the symptoms in that quiz show up, you're in bad shape!!!! It's important to recognize it and get treatment BEFORE a lot of those things happen.
Fortunately, if you're in treatment for Sjs, the treatment is basically the same as for Lupus, so it's kind of killing two birds with one stone. Though of course you still want to keep on top of everything and know what's going on.