I agree about WISC and feel it is still fairly accurate for "basic" IQ placement. There are plenty of other tests available if you are searching for a possible solution to a problem, though. As for online, I haven't a clue.
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It's important to DO something with the information you receive though... when my IQ was tested (7th grade) due to problems in some classes, I tested genius. BUT no one told me and no one helped me compensate for my "symptoms" of boredom and exasperation when other students didn't "get it" and had to keep asking the teacher questions. It became a handicapp.

Both my sons are genius also, but in different ways. When the school found out about the younger one (who was having difficulty in class) they had wanted to place him in LD (they receive more federal money that way.) But after finding out his high IQ they decided to... DO NOTHING for him!!!! I put them both into private schools who catered to their needs. He has a high position protecting us now, the older son is region manager for a large electronics/audio franchise.

Hope you find the answers you need!