* Subject: Math averages will likely differ from English averages.
* School: Schools in wealthier districts often have higher average test scores than those in lower-income districts.
* Specific test: A pop quiz will have different scoring than a major exam.
* Teacher: Grading standards vary from teacher to teacher.
* Grade level: Sixth graders might average differently than eighth graders.
While a general *goal* might be a "B" average (around 80%), it's impossible to give a true average without much more specific information.