Imagine you have enough experience to gain two levels as a wizard.
Instead of choosing lower level spells to add to your spell book - can you delay adding spells to your spell book until your next level gain?
The reason we ask is because we notice that the tables list wizards as having x known spells - but it does not specify which level of spells they are. When we roll up a 5th level wizard - do we need to sit down and figure out the match imagining and then simulating how many spells of each level that person would have seen - or can we just look at the list of spells and pick out the x number of spells that wizard would know?