Dear Gautam,
I would like to tell you that there no entrance Examination at Government Polytechnic college, ambala.
For diploma courses eligibility criteria is
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Candidate vmust be Passed 10th Std/ SSC Examination
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He or she should obtained at least 35% marks (33% in case of candidates belonging to SC/ST at the qualifying examination.
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As compulsory he/ she must be Passed in Maths and Science subjects in the qualifying examination.
you can refer to the following link
https://www.careers360.com/colleges/government-polytechnic-college-ambala/amp
I hope this information helps you
all the best