The new joiner may need to submit employment history forms and self certify his/her past employment history, before/while joining new govt. job.
The Govt. Establishment may ask for relieving certificate from past employer.
You may get accused to double employment and concealment of facts.
It is suggested that you not resort to it.
If you have declared yourself as fresher in job application then you may not be allowed to edit/amend your job application or resume that you may need to submit again before joining.
In the meantime you may go thru attachments.
You should consult elders in the family, well wishers, and show the job advertisement, interview call letter, offer letter, appointment letter, bond of private company, and any other document you may deemed fit ……………along with elders in the family to a competent and experienced labor consultant/service lawyer, give inputs in person, understand the merits.
Avoid acting on your own and proceed under wise advice of elders and expert advise of your lawyer.
You may proceed as deemed fit at your end.