1) as per eligibility conditions for post you should be registered with any employment exchange in Uttarakhand.
2) you are working for central govt and not registered with employment exchange .
3) as on date you do not satisfy eligibility requirements and your candidature would be rejected
4) you can file writ petition in HC to challenge order of rejection . if for those working for state govt registration is not mandatory then for those working for central govt same rule should apply