OB/GYN Board

I'm taking the OB board soon and I need advice on the best practice questions please! I'm debating between click to learn exams from URR or the my ultrasound tutor quiz portal. If anyone has any suggestions to help me please let me know. My funds are limited right now so I can't afford to get both, if anyone knows any good free resources, quizlets, or anything else that would help a lot as well. Thank you!