Hello Aspirant,

Sorry, you can not apply for UPSC CDS exam,only graduate students are applicable for CDS Entry. If you are interested to join army after 12 as commissioned officer you can go for NDA exam “National Defence Academy Exam”. It is also conducted by Upsc just like as cds exam.

To know more about NDA/NA visit link given below

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjR3L3arc35AhWFkpUCHeG1Aw4QFnoECAkQAQ&url=https%3A%2F%2Fcompetition.careers360.com%2Farticles%2Fhow-to-prepare-for-nda&usg=AOvVaw0QgxfCCy2F6evWAyUzVu7U

Hope it Helps,

Thanks.