What is the cut-off of cet 2019 ? (approx) what if i score less percentile , will i be able to get admission in good college ?

I assume that you are talking about MAH CET for MBA admissions, there is no such thing called cut off for clearing CET. However, different colleges have different cut off percentile in order to shortlist candidates for further selection process. This cut off varies college to college. So first thing you need to do is shortlist colleges, you are seeking admissions to, post that you can check past trends of cutoff percentiles for those colleges.