For appearing in Junior Translator exam you should have at least any of the following qualification and below the age of 30 years.
A Master Degree or equivalent in Hindi or English with English and Hindi as compulsory or elective subject or medium of examination at degree level OR
Master Degree or equivalent in any subject other than Hindi or English with Hindi or English Medium and English or Hindi as compulsory or electives subjects at degree level OR
Master Degree or equivalent in any subject other than Hindi or English with Hindi and English as a compulsory or elective subject or either of the two as medium of examination and the other as a compulsory or elective subject at degree level and recognized diploma or certificate course in Translation from Hindi to English and vice-versa OR
2 years experience of translation work from Hindi to English and vice-versa in Central or State Government Offices including Govt. of India Undertakings.
As you are not a Post Graduate, thus you are not eligible for appearing in Junior Translator Exam.