In addition to the scheduled classes, there are free timetables.
These are the available hours:
Monday – 10h to 11h and 17h to 18h
Tuesday – 12h to 13h and 15h-16h
Wednesday – 10h to 11h and 15h-16h
Thursday – 15h to 16h and 16h to 17h
Friday – 12h to 13h
Saturday – appointment only