well the last rank admitted each year changes, depending on various factors like level of paper,other entrance exams etc etc.....so considering the last rank admitted last year,u need to get within the rank 2000...and since u r a keralite,of course RESERVATION plays a great role be happy :)....just score around 450 marks(just an assumption),try to score more,give ur best...and sure u will be a CUSATIAN one day.... :)