According  to the list of marks vs rank analysis 2020 78 in kcet  you will have around 6000 according to expected mark vs rank list 2020 list as you did not mention which category considering it as general you can expect  to get a rank around 6000 but it is not exact its just an analysis or expectations.

However you can predict what colleges and how manycolllegs you can get by using the rank predictorlink mentioned belowso chech it out:

Hello aspirant ,

You have got 78 marks in pcb for karnataka cet examination. With this mark you will have a rank in between the range 5000 to 5500. You can use the link given below to know about the colleges that you will get with this rank