States like Montana require students to have their high school diploma or GED before applying to barber school. In this case, have a copy of your diploma on hand for when you visit the school to fill out an application.
In states like Illinois, where you don't need a high school diploma to apply for barber school, you'll most likely have to take an entrance exam to be considered for acceptance. The tests typically assesses general knowledge like math and reading comprehension, and will not usually be about barbering specifically.
Without the money to finance your barber schooling, you obviously can't attend classes. According to CostHelper.com, "Program costs vary significantly by school, from around $2,000 to more than $11,000. All reputable programs are geared towards preparing students to pass state licensing exams."
Not only do you need to make a sizable deposit up front to enter school, you must also pay for your supplies and books if not already included in tuition, the fees for testing, and the fees to obtain your license upon completion of barber school.