Numerous Test Publishers exist and have been providing high quality assessment to Employers for the best part of 4 decades.
The world leaders for these assessment were SHL now known as SHL CEB, however Kenexa (now known as IBM Kenexa) caught up fast and even at one stage overtook the number os assessment they delivered globally per year (c. 30 million in 2011).
Whilst other providers exist, SHL CEB and IBM Kenexa are by far the leaders in this space.
GF is run by previous SHL and Kenexa test developers and consultants, all of whom are Chartered Organisational Psychologists with significant experience in this space.
We have provided a brief summary of the major test providers who you are likely to receive a test from should you apply for a graduate role within a large corporation