You can't grind the skill; you have to use it in combat and that's not really difficult. You can fight a mudcrab with a Bound Sword and at early levels, it'll increase pretty fast. The Flame Atronach is great too; she throws a mean fireball while you're doing something else. She's good for distracting the enemy too.
:tes:
wrong. totally wrong. you can grind nearly all skills its just the HOW TO.
to simply reach conjuration 100 in less than 2 hours of playtime simply kill somthing (rat mammoth etc. some creature does not matter which one) then simply use soultrap on the dead body with both hands (NO DUAL CASTING) simply spam it on the body with minus % conjuration manacost gear. if mana gets low rest for 1 hour and continue. profit. tough conjuration becomes useless on master diff since the summons dont scale while nearly everything else does. its stupid.