Hello,
Previous year question papers are very beneficial to improve your performance in JEE mains preparation. They help you to get the idea of all the types of questions asked in the exam. But to score 200+ in JEE Mains you also need to practice a varieties of questions. Also you need to clear your vey basics so as to attempt any type of questions right from the ground up. You need to frequently practice lots of mock tests.
You have time till September to practice a lot and you can get 300+ in JEE mains if you work hard and smartly.
You can enroll for the JEE mains crash course by Careers 360 which provides previous year question papers, frequent mock tests, video lessons and 24x7 doubt clearing and many more. Aal tgis is for just Rs 6999. Please visit this link https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/careers360-jee-main-crash-course/amp&ved=2ahUKEwiAk5OE2ezqAhVeILcAHV6BBAsQFjABegQIBRAB&usg=AOvVaw2qqSyBCop2N7ziMSe61Y3S&ampcf=1

Hope it helps

No it is unlikely to happen because the pattern and questions of JEE paper change much every year. Very few questions repeat in JEE and even if they repeat then the options and values change much.

So it would be better if you do a superficial preparation and then give the mock exam. So it will give you an experience and then you can prepare well.

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