Need urgent help!

Hii i cleared jee advance 2026 and i wanna join iitkgp , I'm getting Btech in agriculture , but i want to prepare for Tech placement , i have following fee queries from seniors.

1).Is branch change available? What's the requirement.

2.Can i get enough free time for self study and coding if i take agriculture branch.

3).Should i take BS instead of Btech and later try to change the branch to any btech? Is itt possible??

Please answer if you cann it's very urgent,

Thank youuu