well..you have chances for INST,IT,PSRF,PHOT in the main campus..:)
you will have to remain patient until one or two allotments get over..:)
it purely depends on your interest..:) if you are good at chemistry go for PSRF...if you are good at Optics and Physics go for PHOT..if you are good at Maths and Electronics go for INST...:)
all the best mate..cheers..:)