Hello there,

You can get mind maps in NCERT reference books and it is available in NCERT support material books. Also, you can find all the formulas and key concepts in NCERT support material. It is generally distributed by the government in various government schools. Specially it is distributed by government of Delhi. You can access it's PDF which is available free of cost.

Nevertheless, you can learn tips and tricks for making mind map of your own from career 360 website as well.

Hope this will help!