A C210 STUDENT WITH A CFI TAXI ACROSS RWYS 25L AND R AT LAX WITHOUT A CLRNC.

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THIS WAS AN IFR TRAINING FLT FOR ME TO LAX WITH MY INSTRUCTOR BECAUSE IT WAS AN OPPORTUNITY FOR IFR TRAINING AND I DID NOT WANT TO FLY INTO LAX BY MYSELF AS I HAD NEVER FLOWN INTO LAX. UPON LNDG I CONTACTED GND AFTER LEAVING THE RWY AND WE WERE GIVEN A SERIES OF DIRECTIONS TO THE FBO. WE HAD WANTED TO GO TO XXX FBO AND ASKED IF WE SHOULD GO TO ZZZ FBO SINCE IT WAS CLOSER. I WAS TAXIING AND MY CFI WAS READING THE ARPT DIAGRAM. WE BELIEVED WE WERE FOLLOWING THE TXWYS AS INSTRUCTED; TXWYS E; S; C; T. AT TXWY T WE TURNED L AND CROSSED TXWY B AND WE WERE CONFUSED AS TO THE LOCATION OF THE ZZZ FBO; WE PAUSED AT RWY 25R LOOKING DOWN THE RWY AND WE ASSUMED THAT WE WERE OK TO CROSS AND CONTINUED ACROSS RWYS 25R AND 25L ON TXWY T. WE PROCEEDED L ONTO TXWY A AND I ASKED THE GND CTLR FOR DIRECTIONS AS I BELIEVED I WAS IN THE WRONG PLACE. HE VERIFIED THAT WE HAD CROSSED RWYS 25R AND 25L AND GAVE US A TELEPHONE NUMBER TO CALL AND DIRECTED US TO XXX FBO. I SHOULD HAVE ASKED THE GND CTLR IF WE WERE INDEED CLRED TO CROSS THE RWYS BEFORE XING.