USEFUL SPELL COMBINATIONS:

(1) Poison and Cure Poison.
    Don't forget you can cast spells upon yourself!
(2) Blindness and Cure Blindness.
(3) Plague and Cure Disease.
(4) Curse and Remove Curse.
(5) Fireproof and Flamestrike.
(6) Any damaging spell and any healing spell.
(7) Maladictions and Cancel.

OTHER TIPS:
(1) To best practice spells of transportation, gate/portal/nexus to
     things that don't exist.
(2) You can cast spells upon yourself.
(3) Take advantage of ranged spells (lightning bolt, fireball, magic
     missile) to harm creature in other rooms and practice the spell at
     the same time.
(4) Casting while riding increases chances of lost concentration, thus
    improving chances of learning from mistakes.