Hey Namita, 

Making a portfolio is never an easy job. I would help you with some important points.

• First of your skills should be effectively potrayed.
• Your graduation marks are always important but not more than your ability,your motivation, your knowledge,and your zeal to work in this profession.
• Your portfolio must be effectively presented in a systematic manner which is informative and at the same time attractive.
• Try to make your portfolio not short but also not a lengthy one. It should contain the important and best projects you have worked on.
• You should make different portfolios, some may be accepted while some may be rejected.
• CV should have relevant informations.Personal details including id proofs,address,status should be present. 
• Drawings should be included but to a certain extent.
• The cover letter should contain your skills and abilities, why you are interested,what draws you,your information about this project,etc.It should be brief. 

Hopefully the points should help you to figure out your portfolio.

Best of luck for your career ahead.