SoftTest only works on the Windows platform so if a student has a Mac, he/she can use it if BootCamp is installed on the laptop. Many schools, including us, do not allow students with Macs to use SofTest because of the security risk associated with rebooting during the exam.
Exam4 by Extegrity is used by 50 law schools. It seems simple to use with no need to upload and download answer files. Is there a security risk? According to them – NO! According to SofTest, students can use copy paste macros.
Electronic Blue Book by CompuTest is another company with a Mac version. According to SofTest, the same security problems as Exam4 exist with this software.
Examsoft (SoftTest) is by far the most popular software used. 110 law schools use it and it is used on the NYS, FLA, PA, VT and many of the Bar Exams.
This blog has a good summary: http://www.maclawstudents.com/blog/law-school-exam-software/