A C172RG LOW-TIME SINGLE PLT; IN THE PATTERN; AT PAMR EXPERIENCED AN NMAC WITH 2 ACFT AFTER HE FAILED TO EXTEND HIS CLBOUT AS REQUESTED BY TWR.

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ON SHORT FINAL TO RWY 24 AT PAMR; THE TFC BEHIND ME IN THE PATTERN ADVISED ATC OF 2 ACFT ENTERING THE PATTERN/AIRSPACE. TO THE BEST OF MY KNOWLEDGE; NO PRIOR COM WAS MADE BTWN THE 2 ACFT AND ATC. THE ACFT BEHIND ME WAS INSTRUCTED TO MAKE AN EVASIVE 360 DEG TURN. I CONTINUED WITH A TOUCH-AND-GO; AND THE 2 EXPERIMENTAL ACFT WERE INSTRUCTED TO FOLLOW ALONG SIDE RWY 24 AND ENTER A L DOWNWIND FOR RWY 33. I WAS INSTRUCTED TO EXTEND MY CLBOUT FOR SPACING AND; UPON MY TURNING XWIND TO DOWNWIND; I WAS FURTHER INSTRUCTED TO CLB; IF ABLE; ANOTHER 300 FT (THIS WOULD BRING ME WELL ABOVE PATTERN ALT) AND TURN TO THE R. AT THIS MOMENT THE FIRST AIRPLANE CROSSED MY FLT PATH JUST AHEAD AND DIRECTLY BELOW; FOLLOWED IMMEDIATELY BY THE SECOND AIRPLANE WHICH CROSSED DIRECTLY BELOW ME. I BELIEVE THAT AN UNFAMILIARITY WITH THE AIRSPACE AND A LACK OF PILOTAGE AND NO USE OF RPTING POINTS CONTRIBUTED TO THIS INCIDENT. THE MERRIL CTLR DID AN EXCELLENT JOB OF HANDLING THE SIT; ALTHOUGH I THINK IT MAY HAVE BEEN MORE APPROPRIATE FOR ME TO TURN AN EARLIER XWIND TO AVOID THEIR FLT PATHS ENTIRELY RATHER THAN EXTENDING AND XING IT TWICE.