As with all education questions posted on Kudoz, it very much depends on the target readership. The term used nowadays in British secondary schools is 'form tutor'. Below are some of the 90,000 examples found on Google:

The following list provides contact names for all form tutors. If you wish to discuss your child’s progress or other matters relating to your child’s time in school their form tutor is probably the best person to talk to.
http://www.sloughgrammar.berks.sch.uk/about-us/our-people-fo...
The module aims to ensure that students understand the pastoral role of the teacher and their moral and legal responsibilities and develop the skills required to work as a form tutor in building relationships, managing information and communication channels.
http://www.info.rdg.ac.uk/module/0405/ES/ED3PT1.htm
Form Tutor Job Description
http://www.stclementdanes.org.uk/recruitment/jobdesc_form.ht...
THE FORM TUTOR’S ROLE
All staff have responsibility for the development of personal and social skills. However, it is the Form Tutor who is the key to the Pastoral Curriculum at Eskdale. The Form Tutor not only listens and advises students when they have a worry, they also monitor the progress their students are making personally and socially, and adjust their tutorial programme to meet the needs of their own students. It is not good enough to leave the development of personal and social skills to chance - the processes have to be managed.
http://www.eskdale.n-yorks.sch.uk/prospectus.htm