I scored 85% the first time on 55 exam. why you need a 55 exam doing day trading. 55 exam is only the people working on the trading desk in a broker to customer relationship.
I know some prop firms required 55 just to weed out the unwanted "wanna-be-day traders".
just have to read the materials and more importantly do the questions in the back of the materials over 3 times. Then, you should ace the exam.
good luck testing....