When can you take certain tests? That is, you, my friend, are looking for schedules for the exams.
Image is credited to danielmoyle.
So, I found some test dates for this year (2012) that I wanted to share. If your exam is not listed, please leave a comment with a weblink. That would be very much appreciated.
SAT
http://testprep.about.com/od/registrationinfo/a/SAT_Test_Dates.htm
ACT
http://www.actstudent.org/regist/dates.html
LSAT
http://www.lsac.org/jd/lsat/test-dates-deadlines.asp
GRE
http://www.ets.org/gre/revised_general/register/centers_dates/
MCAT
https://www.aamc.org/students/applying/mcat/reserving/261800/deadlineandscorerelease.html
PCAT
http://www.pcatweb.info/
ASVAB
http://www.asvabtutors.com/testing-dates.htm
GMAT
http://www.mba.com/the-gmat/schedule-a-gmat-appointment.aspx
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PRAXIS
http://www.ets.org/praxis/register/centers_dates/
USMLE
http://www.usmle.org/