Search "STEM activities" and a multitude of sites come up. You can find a lot of sites for "science fair projects." Googling "homeschool projects" yields more. Here's a site to get you started.
http://www.sciencebuddies.org/science-fair-projects/search.shtml?v=ia&ia=Energy&p=1
If you are on Pinterest, you can also search there for Engineering projects. Be sure to choose one that sparks his imagination and you can have fun together. Learning is a joy. :)
You might also look at the Instructables" website. Not formal learn ing, but a lot of technology involved projectsd that are interesting, hands-on, and dometimeds fawsirly cheap to do.
Delhi NCR reminds me of NOIDA, where you have Genesis Global School's Genesis Learning Studios. GLS had a range of programs from which you can choose your child to be in. GLS Robotics can prove top be a good place for your son. For more details do visit GLS's official website.
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