I don't know specifically about Glencoe HS, but I know that in my school district they have a system they refer to as "Parent Assist." Parents sign up at the school office at the beginning of the year for free, then they can log onto the Parent Assist web site any time to check students' grades, schedules and more.
I am in the Molalla River School District, but perhaps Hillsboro has something similar. The "Parent Assist" web site URL is: Glencoe has something similar. I recommend calling Glencoe's office, and asking about what they offer: 503-844-1900.
Best of luck,