issue in not remembering the topics of the chapters.

I'm trying with all my efforts to archive good marks in audit,but my marks are stuck in between 50% to 60%. I'm referring study module of icai as well as trying to solve all past years papers and MTP and RTP. yet no good results is seen. also , everyone says to learn all the topics of icai module, but I see it's not possible for me to learn all the topics thoroughly.please help me how I can archive more marks in audit