Hi dear,
There is no boundaries in your subjects. If you are graduated from a recognized university then it is enough for CDS. For some fields engineering is compulsory. You can check details here
https://www.google.co.in/url?q=https://competition.careers360.com/articles/cds-eligibility-criteria&sa=U&ved=2ahUKEwjnltzDmdrnAhVu7HMBHRCyBZcQFnoECAkQBA&usg=AOvVaw13xVw6mBaniQ2DAT3V4BbX
Hope it helps.
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