Hello Ayush,

The name of science fairs for high school students organized in India are-

• Google Science Fair-It is one of the top science fair in India for students between the age group of 13 to 18 years. Google science fair provides a chance for students to showcase their talent and projects in front of the world.
• Dhiru Bhai Ambani International School Science Fair-  It is a platform for students to present their effective and efficient models in the field of science . Top projects and models are chosen for competition at various levels.
• Intel International Science and Engineering Fair-INTEL INSEF is a program organized by the society for science and the public (SSP). It is one of the top global science fair organizers. It offers students the opportunity to take part in competitions taking place at international level.
• FGSI-FGSI provides the best opportunity to come up with new, creative and innovative ideas and models to showcase it to the global world. It has its presence in several countries like USA, UK, Mexico,  Germany, Belgium,  Russia etc.

I hope it helps and all the best

Thank you