b) Secondly, ossification test will only give a broad assessment of the age. It cannot give an exact age. There is also an element of margin of plus or minus 1 to 2 years. Even if we permit the said test, it does not lead us anywhere. It will have no bearing on the assessment made by the Trial Court after the inquiry; c) Thirdly, the first preference for determination of age is the birth certificate issued by the school or a matriculation certificate. Although it has been submitted that no birth certificate of the school was submitted, learned counsel for the appellant has pointed out from the documents attached to the report that in addition to the mark sheets and the school leaving certificate, the birth certificate was also filed which is Annexure I-3 to the report. It is in the absence of the first category of documents being not available that the birth certificate from the municipal corporation is to be considered; and 11