Hi Sujatha,
See it depends on college to college, you may sometimes find a normal college much better due to reasons like the place where it is, as a convinient place to reach attracts more companies and thus there are more opportunities and more exposure. But still for a fact an Autonomous college definitely has an edge over a normal one, for many reason like autonomous college have a dedicated cell for placement drives and since it somewhat manages it's on funds. It can reach out to more companies and bring more inputs.
Good Luck !!
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