I have passed my 12th class in 2017.Am i eligible for ZCO this year. Also i have not taken admission to any college.
No you are not eligible. One of my friends, who is on a drop year asked the same to Madhavan Sir. He replied no.
Who is Madhavan Sir? 
@vijju123 Dean of Education in CMI. He is the one in charge of conduction of the informatics olympiads in India.
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Thanks for the info!