“Restrict” is a C1 level verb that candidates can use in their B2 First exam. It means to limit something and can be used by candidates when talking about a variety of different topics.
Examiner: “How do you think the government can help people become healthier?”
Candidate: “Well, I think they could do something like restrict the availability of products such as cigarettes or alcohol…”
…In my personal opinion I think it is important for parents to restrict the amount of time they allow their children to use tablets and other electronic devices…