ACFT TAXIING FOR DEP AT GRR CROSSED RWY WITHOUT ATC CLRNC.

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I WAS TO HAVE BEEN A PAX ON A BUSINESS FLT TO TVL; WHILE ANOTHER PLT WAS CHKED OUT BY AN INSTRUCTOR. BEING PRESSED FOR TIME; IT WAS AGREED THAT AFTER THE PREFLT I WOULD FLY L SEAT AS I WAS CHKED OUT. THE NEW PLT WOULD OBSERVE FROM THE R SEAT; AND THE CFI WOULD BRIEF FROM THE L BACK SEAT. I HAD NOT FLOWN FROM THE SW RAMP AREA AT GRR IN YRS. I RECEIVED A TAXI CLRNC TO RWY 28L; INTXN B DEP. I NORMALLY REFUSE INTXN DEPS; BUT ACCEPTED IT; THINKING THAT TXWY B WAS NEAR THE THRESHOLD. AS WE TAXIED ACROSS RWY 35; AND APCHED WHAT I THOUGHT WAS TXWY B; GND CTL CALLED AND SAID I HAD PASSED IT AND CROSSED RWY 35 WITHOUT A CLRNC. OTHERS IN THE AIRPLANE TALKING HAD NOT HELPED; BUT I WAS MORTIFIED THAT I HAD VIOLATED A TAXI CLRNC. THERE WAS NO CONFLICTING TFC. I THEN REQUESTED THE FULL LENGTH OF THE RWY; AND RECEIVED A CLRNC TO TAXI TO THE END. HAD I REALIZED THAT TXWY B WAS NOT WHERE I THOUGHT IT WAS; (I WAS THINKING OF TXWY A; WHICH IS WHERE PEOPLE USED TO GO FOR INTXN TKOF); I WOULD HAVE REFUSED THE CLRNC. IN THE FUTURE; I WILL SIMPLY REFUSE INTXN DEPS AND STOP MAKING EXCEPTIONS; BECAUSE I'M IN A HURRY.