|Test||Subjects tested||Total test time (complete battery)||Test difficulty||Report|
|Cost||Degree required to test|
|CAT/5®||reading, language, spelling, math, science* and social studies*||2.5-3.5 hrs||Easy||Simple||$40||No|
|ITBS||reading, language (includes spelling), math, science*, social studies*, sources of information*, cognitive abilities*||3-5 hrs||More difficult||More detailed||$50-70||BA/BS, OR teaching certificate, OR teach or taught in public school.|
|SAT||reading, math, language, spelling, science*, social studies*, listening*, thinking*||3-6 hrs||Most difficult||Very detailed||$50-70, +$20 app fee||Bachelor's, OR teaching certificate, OR teach or taught in public school.|
These are just the basic considerations. There are other considerations out there, and a wide range of opinions about tests, if you go searching for them. But it helps to be able to see the "in a nutshell" info side by side, so there you have it. There are also other testing options, but they may or may not be approved for use in your state. These three are the most widely recognized, from what I've found.
The Cat5 test can be purchased here, and the ITBS and SAT tests can be purchased here.