Vocal range question?

Practising scales is always a good thing to do, but do not attempt to go any higher without a professional tutor, there are ways of accessing higher notes, but you should never try to stretch your voice higher than its naturally capable of going, you can do yourself damage by forcing note out. If you sing as a b, but have told you could be a tenor, then it sounds to me as though you have a great range already. As a singer I would suggest you concentrate on the quality of the notes you can sing and address reaching higher notes at a later date when someone is there to guide you through this, I also recommend cutting down on daily products and focusing on breathing techniques as this will help you also :)