Hello Aspirant,
UPSC CDS examination is conducted by UPSC twice a year to recruit young officers in indian armed forces Army,Navy & Air force.
Main eligibility for CDS is graduation in any stream and there is not any percentage bar as well.
NO,as per educational qualification you can not apply being 2nd year student however in 3rd year you can apply as appearing candidate.
To know more about UPSC CDS exam syllabus,paper & exam pattern visit link given below
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiym72er835AhUHu5UCHQJbD5IQFnoECCEQAQ&url=https%3A%2F%2Fcompetition.careers360.com%2Farticles%2Fcds-notification&usg=AOvVaw1W3fh2FeyOFeeEBQjlfOQV
Hope it Helps,
Thanks.
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