would like to grow a full fledged tall "GIANT SEQUOIA- Sequoiadendron
giganteum" or similar species in India....
The giant sequoia, and its nearest relative, the California redwood, Sequoia
sempervirens, are natives of the Pacific Northwest, where the climate is more
like England than India. You might succeed in some of the cooler parts of
Assam. Other American trees which are similar, but not quite so closely
related, are the bald cypress, pond cypress, and Montezuma cypress, genus
Taxodium. They are more adaptable & can be grown in hot climates. Do some
research on the Taxodiaceae.
Although they are naturally adapted to swamps, the bald cypress can be grown in
cultivation on dry land. There is at least one in the Brooklyn Botanic Garden.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"The trouble with people is not that they don't know but that they know so much
that ain't so."
Josh Billings (Henry Wheeler Shaw), 1818-1885