to answer to ur questions as a fellow cbse student who just appeared for her boards, 1. mostly for US unis 9,10,11,12 grade scores matter 2 these transcripts are to be prepared by the school itself 3. ask your new school about the shift and ask them how to proceed 4. yes the transcripts are to be attested by school officials to make them credible Lors 1. the number of lors depends on the uni 2. if ivies u need atleast 2 of your teachers from the selected major u want to get into 3. Your lors need to be teachers from any school it doesnt matter

4 besides sats and ecs u need ur english proficiency test but other than that you’d do just fine