1a) If you're planning on comparing IQ scores to SAT scores, you should include age at which the respondent took the SAT. I know of at least one international gifted program, run by Johns Hopkins University, which administers the SAT to 12-year-olds.

1b) Scores on the different sections of the SAT might be interesting. E.g. SAT Score out of 1600; SAT-Verbal score out of 800; SAT-Math score out of 800 and SAT Score out of 2400; SAT-Reading score out of 800; SAT-Writing score out of 800; SAT-Math score out of 800.

2) A mere typo: "Do you attend Less Wrong meetup?" should be "Do you attend Less Wrong meetups?"

3) Two more mere typos, in the Digit Ratio section. a) "Close cover of place a sheet of paper..." should say "Close cover or place a sheet of paper..."

3b) "Use a ruler of calipers" should say "Use a ruler or calipers". Unless "ruler of calipers" is a thing, in which case, ignore 3b.

4) Pedantic grammatical edit from the Digit Ratio section: "Once you have the measures for both your ring and index finger, then divide the length of your index finger by the length of your ring finger." You can remove "then" since your sentence starts with "Once."