Hi Mike,
I took and passed my extra about a year ago by using the tests on
QRZ.com. I started by getting 22 right out of the 50. I took 2 or 3 tests
every day and checked my answers. My score gradually incresed until I
could get all 50 right most of the time. After about 6 weeks I took the
real test and got 45 correct. It worked really well. I also read thetapes
by "Gorden" as background but the test taking, like your doing, did the trick.
73, Carl - W6RGH