Official vendor resources plus CertStud practice materials for exam preparation.
Short answer: the OGBA-101 exam has about 40 questions in 60 minutes, with a passing score of 60%. Prepare with the official skills outline below, then work the 9 domains with the free study notes and OGBA-101 practice questions.
Follow the official OGBA-101 domain outline with CertStud notes and practice for each area.