You'd have to remove so much PII as to make any examination worthless "A student of age <redacted> and gender <redacted> at school <redacted> has a GPA of <redacted>". As little information as "a 16 year old black male at Main Street High School" can be narrowed down to a handful of possible candidates at a lot of CA schools.
I disagree as it depends on how many 16 year old black males there are in that high school. It’s pretty simple to apply k-anonymity to control for an acceptable risk level. And add in generalization of age into groups and many questions can be answered.
I think you could definite answer race x gender x grade but it will be harder when you factor in more unique characteristics like household income or vaccination status, etc.
