India is planning to test fire advanced nuclear-capable Agni 2 Prime ballistic missile next month, highly placed sources said on Sunday. \"The missile, with a strike range of around 3,000 km, has been developed by making some modifications in Agni 2 missile. It will be testfired next month and we hope it will be successful,\" they said. The missile also has a better navigational system and greater accuracy in comparison to the Agni 2 missile,\" the sources said.