Exam
Short Length Challenge - 30 Minutes ~ 2 Hours - Depends on Activeness
Strategy
The 10x multiplier to income for each spell cast is permanent. So your goal is to cast as many spells as possible to rack up the multi before finally casting a group of buffs to get the last push to the target mana of e140.
It is recommended to switch pets several times during this challenge. Pets of particular note are:
- Zombie is a decent starter pet that can help you get a few Pet Experience Upgrades early on as well as charge spells faster.
- Shadow Stalker can charge up
Nightfall, 
Synthetic Entity and 
Rules of Nature. Do so and cast those 3 spells as soon as possible. - Geode can be used to cast spells whose level requirement is too high.
- Spellhound can charge very expensive spells faster. Especially with
Hellrage. You can use it to preemptively charge spells that you are only going to cast later. - Interrogator is useful for the final combo you use, besides the 3 best Incantation Spells,
Primal Power, 
Shattering Strike and 
Jas'Aham's Missile Storm to use for your final combo. - Golem is an easier to use final pet than interrogator. Giving you a multi to profits without overly extending the duration of spells.
Be careful that your incantations will last very long when you get to interrogator, especially if high level. So take this into account when deciding on your path.
When leveling up your final pet, use the demonologist spells that give familiar XP, then cast your final combo of spells.
Although on exam 1 the requirement is low enough that you do not actually need to cast all spells to complete the challenge.
- Max Wisdom to cast spells faster
- Mastery to level faster
- Empathy to level your pets faster after switching them
- Insight for more income is potentially useful in the later exams, but not in exam 1
- Patience for more income is potentially useful in the later exams, but not in exam 1
- Spellcraft for more income is potentially useful in the later exams, but not in exam 1. Additionally it makes summons last longer which harms you, making this challenge take longer. So it should be the lowest priority.