Hello student. Every year cut off is dependent on various factors such as number of students applied for the university, number of people attended for councelling so on and so forth. But 39k is last year cut off and you got 30k. So there are pretty high chances that you might get into manipal university. Branch might be uncertain, but there is a higher propbability that you will be getting into university

Cut off means that you have passed the exam. If you score more than the cutoff then you are passed. But it doesnt mean that you will get the seat because due to high competition  and limited number of seats, only some students get the seat. Just try your best and apply for the counseling.

All the Best!!!