Cut off changes every year and is dependant on various factors like no.of seats available, no.of candidates appearing for the exam, difficulty of the exam, candidate's categoey and top NEET score. Now you haven't mentioned your Category. However, in 2018, under State Quota:



General Category: 589

SC:450

ST: 300 secured seats in Trivendrum Medical College. Under All India Quota:



General Category: 599

SC: 459

ST: 422



So your score should be atleast 50-75 marks more than the last year's cut off for your category to get a Medical seat.