Sea Breeze I notice you said about yourself that "The 8th grade was the last grade I completed in High School." Don't you mean that the 8th grade was the last grade you completed and that thus you did not complete any grade of high school? Or do you really mean that 8th grade was really a grade in high school at that the time and place you went to 8th grade.
I have always lived in the western USA and where I went to school the 8th grade was the last grade of elementary school at the school I attended before high school. [My school was kindergarten though 8th grade, but kindergarten preceded 1st grade.] In my then city it later (starting in the year right after I graduated) became the last grade of middle school, but in both cases 8th grade was the last grade before the start of high school. 9th grade is the first grade of high school (with 12th grade being the final grade of high school.
However my maternal grandmother (who was raised in the south, in the USA) who said she while young was never permitted to attend 8th grade because she was black and that blacks were not allowed to attend high school. [Much later as an adult she obtained further education, apparently even high school education and, according to mom, took some college courses. My grandmother was a devout JW, starting from before my mom became an adult.] She thought 8th grade was part of high school, but to me that idea is wrong. A PDF of a census document posted on Ancestry.com
mentioned that my maternal grandmother completed 8th grade, despite my
grandmother saying she never attended 8th grade and despite her saying she was
forbidden by racist laws in the southern USA of the time from attending
8th grade and high school. [My said that the census worker who filled out the census form might have falsely claimed that my grandmother attended 8th grade, in order to hide the fact the fact of grandmother being withheld from attending 8th grade. But I doubt that view is correct.]
Several months ago I checked a Wikipedia article on the topic and it confirmed that in the USA that 9th grade is the first grade of high school.
Sea Breeze, were you raised in the south (the part of the USA which commonly called 'the south", even though there are western states in the southern USA which are excluded from be called part of the south)?