Question: Who took test #4?
SQL: SELECT "Test-taker" FROM "1-10749367-3" WHERE "#" = 4.0;

Question: What episode aired on 18 April 2007?
SQL: SELECT MIN("#") FROM "1-10749367-3" WHERE "Air Date" = '18 April 2007';

Question: Who had the challenge of Night Driving?
SQL: SELECT "Test-taker" FROM "1-10749367-3" WHERE "Challenge" = 'Night Driving';