"Well professor I think it would be more useful to know a few spells well then to know a number of spells you can't do that well because it is important that every spell you plan to use you know it well that way you can use it successfully well when you need to. As for the seccond question I personally find it's easiest to learn a spell under pressure that way you're concentration is high because you fear something and therefore you're success rate is more likely. As for the 3rd question we really can't just rely on spells learned in school for our age group. It's best I think to try to ge above and beyond and try to reach new herizons you never thought possible in spellwork till you tried. Yes it may be more difficult but I personally would rather put in the work and concentration to be self sufficient if I do come across danger. And as for you're 4th question you can learn from you're peers, experience, or the library, all hold information on spells but my guess is books from the library would be the most accurate unless you go to a corrupt school at which time you can only rely on you're peers and what they can get from uncorrupt areas into the school which is not easy and seems impossible but if there is a will you can find a way", Fred responded.