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Scroll down to the bottom of the page on home to see the weightage of all topics from 2016 in all design tests
Please watch this webinar on Creating a Portfolio for Indian and Abroad Universities. This should help you out
Brilliant.org is a great website/app for maths. Philip Carter, mensa books, and Arihant books are great too.
They will give you a small booklet in which you have to fill your details and you can start drawing on the paper. Don't worry they will give you all the instructions you need