In high school I am taught that Group 7 were halogens and Group 8 were noble gases, and Group 3 the boron group, Group 4 was carbon group, etc. Then when I looked up the groups, I found that noble gases were group 18, halogens were group 17, Group 7 was the manganese group, ...
The school said that their numbering is based on counting valence electrons, and the transition metal columns have no business in their lessons.
So schools don't use IUPAC conventions.
How standard is their group name scheme?