Hello,
.
CET exam will be of 200 marks.
Physics and chemistry=100 marks(one and half hour)
Mathematics=100 marks(one and half hour)
.
Syllabus will be based on 11th and 12th classes.
There are no negative marks.
.
How to prepare:

• Make your own notes
• Prepare your time table
• Practice Mock test
• Seek guidance
• Time management
• Revision
• Practice old question papers

Hope you know about syllabus.
.
Tips if your in exam hall:

• Don't waste your time if you are stuck in a particular question.
• Questions will be tricky,read them twice before answering.
• Don't use short cuts
• Firstly attempt minimum score that are required to clear the section cut-off.

Best of luck.