From Route 93 South (heading North):

Take 93 North to Exit 20, the Logan Airport exit.
Merge onto I-90 East / Mass Pike via the exit on the left toward Logan Airport / South Boston.
Take the exit toward Rt. 145 / Bennington St. / Chelsea.
Stay straight to go onto Vienna St.
About a mile up, take a right onto Bennington St. / Rt. 145.
Another mile up, take a right onto Saratoga St., to stay on Rt. 145.
Follow Rt. 145 which turns into Main St., and the high school is directly behind the White Hen, # 372 Main St.

From Route 93 North (Headin South):

Take 93 South to exit 40A toward Boston.
Take the Rt. 16 East exit - Exit 31 - toward Revere.
Take a left onto the Mystic Valley Parkway / Rt. 16 East.
Follow for about 5 miles, then take a right onto Winthrop Ave / Revere Beach Parkway / Rt 145 East.
Follow that for about a mile.
Winthrop Ave will turn into Revere St.
About half a mile up, take a right to stay on Revere St.
Then about half a mile up, take a left onto Main St. The high school is 372 Main St.