This term we're using First Certificate in English 2 (updated exams with answers) published by Cambridge. If you feel you have the time and need for super extra practice, you can acquire First Certificate in English 1, which is already available at bookstores. This book was adopted last semester. Note that you'll also need the CDs for Paper 4.
Older editions are also available. Just keep in mind that there have been changes in the exam format, so some tasks have been omitted or changed. I'll inform you on the changes later on.
This book contains 4 tests with keys and audioscripts for practice both in class and at home. However, if you need to work on grammar and other skills, you should browse for a grammar book with focus on the FCE. You'll probably need to do some self-study to cover major points required in the exam.
Talk to me if you need further information!