Hello aspirant,
I am here for helping you.
As you doubt is about how much percentage you must have in class 10+2 science stream for taking admission in ravenshaw university /college so, you have to score 50% with minimum marks in relevant subjects for having admission in ravenshaw college/university.
For more detail about ravenshaw university/college you can go on the link which I am providing you below:
https://university-careers360-com.cdn.ampproject.org/v/s/university.careers360.com/articles/ravenshaw-university-admission/amp?amp_js_v=a2&amp_gsa=1&usqp=mq331AQA#referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Funiversity.careers360.com%2Farticles%2Fravenshaw-university-admission
I hope it will help you.
For more querries you can upvote me and can ask in the comment box.
Best of luck.