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Here’s where it gets a bit tricky, one of the girls from the group image of Grade 10 we are still analysing, shows a girl who has been identified by her daughter, her birthday is October 27, 1942.
Her daughter maintains that her mother and Stanley Ann Dunham were in the Class of 1960.
If the date of that group image is correct, (and it’s dated by a caption, not something printed on the image itself) then it follows the Grade Ten group captioned as Mercer Island Students dates from 1958.
In other words, what we are looking at might be the first year of Mercer Island Summer 1957 to 1958.
The next grade, grade eleven, would be Summer 1958 to 1959.
And Grade twelve would be Summer 1959 to 1960.

The Grade nine group including the same identified girl shows her in a group with the same teacher who obviously belonged to one of those feeder schools - FOR THREE PREVIOUS YEARS.

So according to the above, any reports I have seen of Mercer taking students from 1956 may not be correct.

Here’s where it gets a bit tricky, one of the girls from the group image of Grade 10 we are still analysing, shows a girl who has been identified by her daughter, her birthday is October 27, 1942.
Her daughter maintains that her mother and Stanley Ann Dunham were in the Class of 1960.
If the date of that group image is correct, (and it’s dated by a caption, not something printed on the image itself) then it follows the Grade Ten group captioned as Mercer Island Students dates from 1958.
In other words, what we are looking at might be the first year of Mercer Island Summer 1957 to 1958. The next grade, grade eleven, would be Summer 1958 to 1959. And Grade twelve would be Summer 1959 to 1960.
The Grade nine group including the same identified girl shows her in a group with the same teacher who obviously belonged to one of those feeder schools - FOR THREE PREVIOUS YEARS.
So according to the above, any reports I have seen of Mercer taking students from 1956 may not be correct.

I am reasonably sure Mercer did not open its doors until 1957 fall. I am also reasonably sure the first class included the class of 59--the class that was Juniors (11th grade) in the 57-58 school year; and Seniors (12th grade) in 58-59 school year.

That would fit your analysis of the class of 60 as having finished their sophomore year (10th grade) in the summer of 58 to become junior's beginning in the fall of 1958 and senior's the following fall, 59-60.