Dear Priyanka,
Even though your post carefully avoids the type of your establishment, it is discernible from your post that the incumbent is an office boy employed at a wage rate less than the minimum wage rate fixed by the Govt under the Minimum Wages Act,1948. First, the readers would be enlightened if you explain the sort of training you intend to impart on a person appointed as an "office boy". Second, an apprentice would be as such if he is taken into apprenticeship under the Apprentices Act,1961 only. I don't think that your Standing Orders will have any scheme of apprenticeship or training in respect of the category of office boys. Even then you have to include trainees in the EPF Scheme if the EPF Act,1952 is applicable to your establishment. Third, even contract labor has to be paid the minimum wages fixed for the category of work in which they are employed. Fourth and final, by changing the nomenclature of the posts, you can not change the classification of the employees. Better, try to convince your management to adhere to law by compliance rather than circumvention as rightly suggested by all above