There’s an app on iOS called “Chinese ATPL Pilot Exam Prep”. Has over 4,000 questions and provides explanations to the answers. You can create your own exams etc and bring it with you and study wherever/whenever. Got me through it handily enough.
And there’s no point “studying”; do the questions over and over until you recognise the answers as some don’t make sense due to translations. I probably put about 6 weeks of moderate effort into it and you realllllly don’t want to have to redo it. Guy with me scored 69%...