How to remember everything from a huge syllabus? 10 points!?

Okay so i've some admission exam this November and the syllabus is huge. I almost completed the syllabus just couple of topics left and i'm sure to complete it at the end of the month. But the problem is I can't remember all the things that i study. Because its a huge syllabus i had to complete it very rapidly to finish it and i planned that i'll revise everything during October. After revising everything am i gonna be able to remember everything that i learned? Is rivision is the only way or is there any other way to remember everything that i learned? Please help me cause i'm really stressed about it and its my dream come true exam.Thanks in advance :)