You can take the test either in Chennai or Bangalore. It doesn't matter. First of all you have to buy a test from
http://suned.sun.com/US/certification/index.html Then you can schedule a test. The test centers can be found from the following link.
http://www.register.prometric.com/Index.asp List of Centers in Chennai and Bangalore
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NIIT LTD
CHENNAI 600034
Phone: 91 44 823 0361 Site Code: IIB 71 UTHAMAR GANDHI SALAI
NUNGAMBAKKAM HIGH ROAD
NUNGAMBAKKAM
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SOFTWARE TECHNOLOGY CHENNAI
CHENNAI 600 006
Phone: 044- 28550218, Site Code: II22 G -3 PRINCE CENTRE
709-710 ANNA SALAI
BEHIND ANAND THEATRE
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PROMETRIC TESTING (P) LTD
CHENNAI, Tamil Nadu 600034
Phone: 28241875 Site Code: II002 NO 15 II FLOOR
ROMAR HOUSE
JAGANNATHAN ROAD
NUNGAMBAKKAM
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EMERALD - BANGALORE
BANGALORE 560027
Phone: 080-51245580 Site Code: II48 UNIT #401, 4TH FLOOR
MONEY POINT, #59
K. H. ROAD
(DOUBLE ROAD)
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NIIT (BANGALORE) LTD
BANGALORE 560025
Phone: 5599379 Site Code: II8 #24 SABARI COMPLEX, 2nd Floor
RESIDENCY ROAD
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IIHT LIMITED
BANGALORE 560001
Phone: 080-5598351 Site Code: IIF23 63, OPP. SALEEH AHMED
INFANTRY