HI

To become a scientist the ultimate degree is PhD. And the path to reach to PhD depends completely on your interest.
You can either go for MBBS after 12th and then after that go into research or you can go for the option BSc and MSc and end up at PhD and carry on with your research field by getting a valid license.
First of all decide which fild you want to be scientist in. It can be biology zoology microbiology physics anything based on your interest. Once you get to know where you have to set your goal, then you decide either to go for MBBS or to go for BSc. after this choice is made, choose a good college and stay focused on your goal and you will definietly achieve what you want.

ALL THE BEST.