Getting admission into any college depends on various factors like cutoff trends of exam,difficulty level of exam,number of seats,candidates appeared and category.Cutoffs usually varies every year.So,you can get clear information about this after colleges release their cutoffs and also you can go for counselling.Moreover,with 30000 rank you can get some decent private colleges.Some of them which offers course of CSE and also the ones in which you have a definite chances are mentioned below:-

1. Srinivas Institute of Technology,Mangalore
2. Bangalore college of Engineering and Technology,Bangalore
3. T  John Institute of Technology
4. Yenopoya Institute of Technology
5. Yellamma Dasappa Institute of Technology

If you want to check for more details then you may go through the below link and also predict your college for clarity.

https://engineering.careers360.com/comedk-college-predictor?ici=cp-listing_engineering&icn=COMEDK-College-Predictor

Hey! With this rank , and considering you to belong to unreserved category , you have good chances gor the following colleges , as according to the previous year cutoffs :

Dayananda sagar college of engineering

Ramaiah institute of technology

BMS institute of management and technology

Siddganga institute of technology

RNS institute of technology

And many more ...

You can check the full list of possible colleges for you by going through the following link :

Feel free to ask any further queries!