I'm a death wizard and my secondary school is fire. I got to lvl 45 recently and now I am unable to get the next fire spell, Inferno Salamander, because I need the spell Scald first. It seems the only way to get Scald is to be a fire wizard and get it as a quest reward? Is this true? If so, is this the case with all schools? Is there a limit to how far you can progress in a secondary school?