are 20 question of past year enough for straight lines?please answer...
Hello Gayatri, Greetings!
Well solving past year papers will help you to get through the exam as concepts are repeated but it will not fetch you a top rank.
So, I would suggest, you should first go through the basic concepts in the NCERT and then, you can try coordinate geometry by S.K Goyal.
But, if you think you are short on time, doing only previous year questions is not a bad idea. Just make sure you have all the formulas and concepts cleared.
Thank you, best of luck.



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