hi Manjunath,

your kcet is rank is 12.6k which is a good rank. you belong to 3A category, kannada medium rural region 

as you have have mentioned you want to opt computer science 

As per kcet, cutoff for rural region is different 

based on your rank, you can get in 

1.  BNM college of engineering 

2. sai vidya institute of technology

3. B. G.S institute of technology

4. A.P.S  college of engineering

5. K.L.E college of engineering 

6. yellamma dassappa institute of technology 

7. reva institute of technology 

8. jain University

9. PES institute of technology ( south campus)

10. NIE institute of technology

these are some colleges you may get in.( not in order )

i hope you get in good and desired college.

If further any doubts to be clarified please feel free to ask