Hands down, go to CPR associates on North Peterson Avenue. You're in and out with no headache. Not to mention they give a very generous lunch, on the house.
http://www.cprassociatesinc.com is their website. The site should have the schedule of classes. They have stuff on weekends, too. They are american heart association approved. Everyone I know goes there. Just be careful if you park on side street. Some of it is permit residential parking. Don't want to risk a ticket. 773.973.6933
Good Luck
Chris
Nursing News