Question

how to cram/memorise huge amount of data at short period before exams??

Answer 1

First to memorise your studies you have to enjoy what you are learning. And check whether you can read by writing or pictures or video or audio(explanation).

Answer 2

• Try to comprehend whatever you read rather than mugging it up.
• Next, have good writing skills, for example if you're a science student, you should know well the technical terms involved as per the context.              
• Break the syllabus into small parts, and do revise the section before going to next.
• Sometimes it's helpful memorizing by writing. Though it's time taking to write everything that you memorize, I'll suggest at least you should prepare short notes wherever necessary. Personally I prefer this way occasionally, especially when I've to read charts and diagrams.        

hope this will help u