Do wizards who take the Wizard of High Sorcery prestige class have to specialize?
Wizards who take the Wizard of High Sorcery prestige class may elect to be “generalist wizards.” The Age of Mortals sourcebook has a sidebar on this, explaining that you do not have to specialize, but you don’t gain the benefit of enhanced specialization at 1st level. Towers of High Sorcery contains a revised version of the Wizards of High Sorcery prestige class, which clarifies this issue.