Final answer:
Test-takers have the right to remain silent as part of their main rights, protecting them from self-incrimination in court.
Step-by-step explanation:
The fourth main right that test-takers have is the right to remain silent. This right ensures that test-takers cannot be compelled to say anything that can be used against them in court. It is similar to the right of the accused to be warned that anything they say may be used against them in court. Both of these rights protect individuals from self-incrimination and are part of the broader protection of individual rights in the legal system.