http://www.actstudent.org/testprep/ The only way to prepare act exam is now through ACTprep online.the different sections of this exam include english, mathematics, science, reading and writing.
Making usre you are ready for the SAT is a very essential thing to ensure good test. You can find the offical test prep at the website sat.collegeboard.com/practice .
You can get help with the DAT test at the "Test Prep Review" website. They have a modular system covering all the categories. Here is the website you should visit, http://www.testprepreview.com/dat_practice.htm.
A good way to prepare for the GRE test is to purchase a prep book. In this website, you'll find the top prep books for the GRE: http://gradschool.about.com/od/gre/tp/topgrebooks.htm
The Mcat is a very difficult test that many people have difficulty with. The best place to find Mcat test prep materials is the Mcat website which is located at Mcat.com/resources.
You can find sat practice test online at the ed.gov website. You can also visit the Sallie Mae website they have a lot of information regarding the sat prep test. You can also visit any local college or university, they also prepare you for the test.
Besides what is on the official SAT website, there are numerous resources online for test prep. But as far as free, full length tests go, you likely won't find one.
A website that I found that provides both online and in class LSAT prep courses is Blueprintprep.com. This website shows documentation of score increases in students that have participated in this test prep so I believe it would be very helpful in getting you prepared for this test.
A site that has ISEE Test Prep Books is Amazon.com: http://www.amazon.com/ISEE-Prep-Recommended-Books-Materials/lm/RPPJ9BBO9OSC6 . Going to iseetestprep.org can offer test prep, too.
The best test prep questions you can find for the ACT is on actstudent.org. There you can find all the prep tests quesitons you can handle to get your prepared for ACT test.
Go to your countys website or your schools district and go to education then go to GED test practice sheets and print.
The best place to take a test to learn English is in a paid course class. Although their are many ways. You could do your English test online or even take a prep test from the library and take that English prep test.
Sylvan learning centers offer prep ACT tests for every grade level. Their services include personal tutors and prep tests for all grade levels. Visit their website for more information: http://tutoring.sylvanlearning.com/sylvan_ACT_test_prep.cfm