Each year you file a tax return, you need to decide between itemizing your deductions, or claiming the standard deduction. For 2007, the standard deduction if $5,350 for single individuals and $10,700 for married couples.
You generally only itemize if your total itemized deductions exceed the allowable standard deduction. Itemized deductions include state income taxes, real estate taxes, mortgage interest, charities, and certain other items known in the aggregate as miscellaneous itemized deductions.
Your unreimbursed job costs are included as part of your miscellaneous itemized deductions, which are only deductible to the extent they exceed 2% of your income.
You asked about whether you can claim certain expenses this year. Unfortunately, job seach expenses to find your first job in a new profession aren't deductible.
What about the cost to take your exams? Any time you incur costs that qualify you for a new trade or business, they are not deductible. That's why med school isn't deductible. Costs that improve your skills in your current trade or business are deductible. I've had many clients tell me that they could work as a physician in certain settings even if they don't pass the board exams. I'm not sure if that's true, but assuming it is, then the cost of taking your board exams would not qualify you for a new trade or business, so would be tax deductible.