This has nothing to do with your code *i think*. By response.write of your sql statement, instead of this:

set rsInsert = conn.Execute ("INSERT INTO user (lastname, firstname, grade) values ('" & lastname & "', '" & firstname & "', '" & grade & "' ")

do this:
Response.Write("INSERT INTO user (lastname, firstname, grade) values ('" & lastname & "', '" & firstname & "', '" & grade & "' ")")

Also, in your SQL sytnax above, you are missing a closing " and ) at the end of the insert statement.

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