12 point gpa to 4 point gpa

Hi all - hope everyone is enjoying their summers. Quick question - I’m trying to figure out my gpa from Scripps’ 12 point system to the normal 4 point system. Can someone put up a table or something to show the conversion? I don’t think its quite /3. My current gpa is a 10.5 and I have no idea what that means. Thanks so much!

I’ve been using this table with I think is not quite correct/kinda inflated: http://nhh.eacs.k12.in.us/UserFiles/Servers/Server_3125651/File/12GPA-4GPA.pdf

0=F, 3=D, 6=C, 9=B, and 12=A. The plusses and minuses are the numbers in between. As in 7 would be a C+.