Ideally BTech AI and Data Science sounds a very interesting course, but ideally in Graduation, you should always go for a more generalized branch, like CSE. A generalized degree helps you explore different domains of respective engineering verticals be it Software, AI, Data Science, Networking, Research, Computer Vision or any other. Ofcorse you may parallely pursue Academic Projects, Internships on Data Science/ML/AI and parallely work on your Profile for a Data Scientist.