I got cat 2023-50%ile and tis was the 2nd attempt. And i prepared my 2nd attempt along with job but didn't score well.what will be right step whether to join avg college or go for 3rd attempt?

Try XAT and CMAT and if that doesn't work try for 3rd attempt. You have a job anyway so I think you can give a few more tries. Yeah I know it sucks but its gonna suck more if you settle for bad colleges, it isn't worth the money. Don't give up you can do this!

how much did you score in first attempt?

can go other entrance exam also. check the upcoming ones :)

join college I had taken a drop was my 3rd attempt. CAT is unpredictable. if you want to give next year prepare along with college but don't solely prepare for it