First of all congratulations for securing a good rank.

As you know there are only 60 seats for integrated Msc in basic sciences in cusat.But there will be high chances for getting admission with this rank. In 2018 last rank admitted was around 700 something for general category. Last Year it rises upto around 1200–1300 for general. So with this rank of 1209 there is a high probability to get admission. Actually it depends on many factors like option registration, KVPY etc. There will be more preference for students who have a Better KVPY rank. So wait for the admission procedures.