The acronym CSCS stands for Construction Skills Certification Scheme. This test examines construction workers knowledge across a wide range of topics to improve safety and productivity on site. It is usually taken as a PC-based touch screen test. Everyone applying for a CSCS card must pass the appropriate health, safety and environment (HSE) test, within the last two years.
There are a few exemptions to this which can be found on the CSCS website. Typically, an exemption will apply if you already have other qualifications in your name that have been achieved within the last 2 years.