Universities have been told by the Competition and Markets Authority to deal more fairly with students.
Some "still have work to do" to fully comply with consumer protection law, says CMA senior consumer director Nisha Arora in an open letter.
The CMA has already "taken targeted action" to improve practices at three universities, the letter to all higher education providers says.
The government must "hold universities to account", said consumer group Which?
In March last year, the CMA set out how universities should comply with consumer law.
This included providing information to allow students to compare courses, and some institutions were asked to amend their practices accordingly.
