See, to become a data scientist, the most important thing that you'll need is mathematics, so if you have mathematics in your class XIIth examination, then your life will be a bit easy. While it's true that companies prefer someone with a technical degree, but if you don't have it, then there is no reason to worry.

You can take up a YouTube playlist and prepare with that as they are very good. Some areas where you'll have to work are:

Data Collection
Data Cleaning
Data Modelling
Data Visualization

Modelling requires heavy mathematical concepts like Machine Learning, so that can be hard, rest everything can be covered quite easily with the method I told.

Hope I have answered your question. All the best!