English / Math and Science you can only practice two times...But...
you can review the test unlimited times and read the explanations on how to get the correct answers.. the actual test is the same as the two practice test but with different numbers / figures.
click on the test that you have already made for math science and english and review the tests.. and learn how to get your answers.
the other part of mollymawk ( aptitude ) is just practice and improve yourself..
good luck with the test