Our games mistress was not a student teacher but was relatively young at the time,which was around 1979. I am guessing, but maybe early twenties. She did not slipper but slapped the back of our upper thighs really hard if you played up too much.
This left visible hand prints which sometimes lasted all day. She was very unpredictable and sometimes did not smack you but just told you off in a somewhat light hearted way. If she did smack you it was always 4 of the best across each leg. Regardless of this, she was very popular with all the girls. I really got on well with her but still managed to get my fair share of smacked legs. Some girls cried but at the end of the day, all was forgotten. If she saw you out of school she would give you a big hug and joke around with you. After I left school I became friendly with her for quite a few years. She had a great personality, very extroverted.