C152 STUDENT PLT ENTERS CLASS B AIRSPACE.

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I SENT MY STUDENT ON HIS FIRST SOLO XCOUNTRY. HE HAD 35-40 HRS AND WAS FOUND PROFICIENT TO FLY SOLO XCOUNTRY BY MYSELF. I SIGNED HIM OFF; AND HE WAS ON HIS WAY. HE FORGOT TO SET HIS DIRECTIONAL GYRO TO HIS MAGNETIC COMPASS; AND PROCEEDED ON HIS WAY. HE SHOULD HAVE BEEN ENRTE; INSTEAD HE ENDED UP IN DETROIT METRO'S CLASS B AIRSPACE. ONCE HE REALIZED HE WAS IN THE CLASS B AIRSPACE; HE DSNDED AND GOT OUT OF IT. HE WAS THEN CONFUSED WHERE HE WAS; SO HE FOUND AN ARPT (WILLOW RUN) AND STARTED CIRCLING. HE WAS NOT SURE OF THE ARPT; SO HE DID NOT HAVE THE FREQ; SO HE SQUAWKED 7700 AND RECEIVED LIGHT GUN SIGNALS FROM THE TWR. ONCE HE GOT DOWN; HE GOT HIS BEARINGS AND RETURNED TO HIS HOME BASE VIA A FLT PLAN HE FOLLOWED AT WILLOW RUN. THE PROB AROSE WHEN HE WAS ON THE RIGHT HDG ON THE DIRECTIONAL GYRO; BUT THE WRONG HDG ON HIS MAGNETIC COMPASS. HE REALIZED THIS WHEN HE FOUND HIMSELF GETTING CLOSE TO SOME LARGE JET ACFT. SOME CONTRIBUTING FACTORS WERE HIS CHKPOINTS; HIS FIRST 2 CHKPOINTS WERE VERY SIMILAR TO THE ONES HE CHOSE; BUT THEY TURNED OUT TO BE THE WRONG ONES; EVEN THOUGH HE THOUGHT THEY WERE RIGHT. I BELIEVE THAT ONCE HE REALIZED HE WAS IN CLASS B AIRSPACE; HIS ACTIONS WERE MOSTLY CORRECT -- HE GOT HIMSELF DOWN!