A PA28 STUDENT PLT; ATTEMPTING A XWIND LNDG AT IWA; DEPARTED THE RWY; MAKING CONTACT WITH A TXWY MARKER.

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THIS MISSION WAS SUPPOSED TO BE A 1 1/2 HR LONG UNSUPERVISED SOLO; COVERING PREFLT PREPARATION; PREFLT PROCS; ARPT OPS; TKOFS; LNDGS WITH VARIOUS FLAP SETTINGS; AND POSTFLT PROCS. WX INFO WAS RECEIVED FROM AWOS; ARPT INFO AND CALCULATION FORMULAS WERE FROM PERFORMANCE TKOF DATA FORM. AFTER INSPECTING THE PLANE; EVERYTHING WAS FOUND TO BE IN SATISFACTORY CONDITION. I FOLLOWED THROUGH WITH THE ABCD RESTART; START-UP; AND AFTER START CHKLIST. I CONTACTED GND AND RECEIVED CLRNC TO TAXI TO RWY 30L AT TXWY K. UPON ARR; I PERFORMED THE ENG RUN-UP; THEN CONTACTED TWR TO REQUEST CLRNC FOR TKOF AND TOUCH-AND-GOES. CLRNC WAS GIVEN; TKOF FINAL ITEMS WERE COMPLETED AND I ENTERED ONTO THE RWY FOR A NORMAL TKOF. I WAS FLYING IN A STANDARD L TFC PATTERN AT IWA. TWR CONTACTED ME AND I WAS CLRED TO MAKE MY FIRST LNDG. LNDG FINAL ITEMS WERE DONE TO ABCD STANDARDS AND I WAS APCHING THE RWY FOR A FLAPS 25 DEG LNDG. AS I WAS ABOUT TO TOUCH DOWN; I BEGAN TO FLOAT A LITTLE OFF CTR AND ELECTED TO DO A GAR. I CAME AROUND FOR MY SECOND LNDG; PERFORMING EVERYTHING AS I HAD BEFORE. I CLBED AND FLEW THE PATTERN TO COMPLETE MY THIRD LNDG OF THE AFTERNOON. ON CLBOUT; I HEARD THAT THERE WAS NO ATIS INFO AND THAT THE WINDS WERE FROM 210 DEGS AT 4 KTS. FOR RWY 30L THIS WOULD PUT THE XWIND COMPONENT AT 4 KTS; JUST BELOW MY 5 KT LIMIT THAT WAS ASSIGNED TO ME BY MY INSTRUCTOR. I WAS CLRED TO LAND AND DECIDED TO SEE HOW THIS UPCOMING LNDG WAS. IF I FELT UNCOMFORTABLE; I WAS GOING TO MAKE A FULL STOP AND CALL IT A DAY; IF I FELT GOOD I WOULD CONTINUE ON WITH THE MISSION. AS I GOT CLOSER TO TOUCHDOWN; I AGAIN WAS PERFORMING THE XWIND TECHNIQUE; BUT I DID NOT APPLY ENOUGH AILERON TO KEEP FROM BEING BLOWN OFF CTR. I DRIFTED TO THE R OF CTR AND TRIED TO CORRECT WITH MORE L AILERON AND MORE R RUDDER. I DID THIS TOO LATE; HOWEVER; AND TOUCHED DOWN WITH A SIGNIFICANT SIDE LOAD. WHEN THIS HAPPENED; I SHOT ACROSS TO THE L SIDE OF THE RWY. I CUT ALL PWR AND APPLIED BRAKES TO TRY AND BRING THE ACFT BACK UNDER CTL. I WAS STILL MOVING FROM R TO L ACROSS THE RWY. I LEFT THE RWY AND WENT ONTO THE DIRT BEFORE WHAT I BELIEVE WAS TXWY L. I WAS ABLE TO MISS THE RWY LIGHTS AND TXWY MARKERS ON THE R SIDE OF TXWY L. I THEN CROSSED TXWY L STILL APPLYING BRAKES TRYING TO GAIN CTL. I LEFT TXWY L AND WAS BACK ON THE DIRT; ALMOST STOPPED WHEN MY R WING CAME IN CONTACT WITH THE TXWY MARKER ON THE L SIDE OF TXWY L. THE SIGN WAS KNOCKED OVER WITH MY R WING AND THE WING HAD A DENT IN IT APPROX 18 INCHES LONG AND 3 INCHES WIDE. THE PLANE CAME TO A COMPLETE STOP WITHIN 5 FT AFTER THE COLLISION. THE PLANE WAS STILL RUNNING AFTER THE COLLISION SO I PROCEEDED TO PERFORM AN EMER SHUTDOWN TO ABCD STANDARDS. WHEN THIS WAS DONE I CONTACTED THE TWR AND DECLARED AN EMER.