Deducting bar exam expenses

You don't enter them because they're not deductible. 

Fees to enter a new profession are not deductible. From IRS Publication 529:

"Professional Accreditation Fees

You cannot deduct professional accreditation fees such as the following.

• Accounting certificate fees paid for the initial right to practice accounting.
• Bar exam fees and incidental expenses in securing initial admission to the bar.
• Medical and dental license fees paid to get initial licensing."

http://www.irs.gov/publications/p529/ar02.html#en_US_publink100027003

Note that it doesn't matter that you don't actually enter the new profession. For example, an individual working as an accountant in a manufacturing firm could not deduct the CPA exam and CPA licenses costs, even though they never intended to practice separately as a CPA.