Hey,
Today's world is full of competition so if you want to get into courses like B.SC., B.COM., BCA, B.Tech, MBBS or any course the percentage in +2 matters, so you need to atleast obtain 90% for your further admission into any College
And if we talk about +1 the marks obtained does not matter much but you still need to prepare well for your exams and try giving the best in you
Hope it helps :)