Choosing between computer science engineering (cse) at JSS, AKG Or kIET depends upon several factors:

JSS academy of technical education: known for good academic performance and infrastructure and have decent placement records. Average package around rupees 4-6 LPA with companies like TCS, wipro etc. Active campus life with various clubs and activities.

Ajay kumar garg engineering college : praised for its faculty and academic rigor . Strong placement records and industry connection. Average package around  rupees 4-5 LPA with companies like Amazon, infosys etc. Excellent infrastructure with modern labs and libraries. Vibrant campus life.

Krishna institute of engineering and technology: consistently ranked among the top private engineering colleges. Average package around rupees 5-6 LPA , with top recruiters including Microsoft, IBM etc. State of the art infrastructure with all student facilities. Dynamic campus environment with a range of activities.

In my opinion KIET is better because it has a very strong alumni network. But you should take your decision considering other points that I mentioned above as well.