You may pursue B.Sc. in a relevant discipline, as per your interest, be it Mathematics, Statistics, Physics or Chemistry. After B.Sc., effectively yoi have many options apart from taking up jobs with relevant skills, you may prepare for Government Service Examinations like UPSC CSE, State PCS, Railways,SSC CGL, SBI PO, IBPS PO and many others. You may pursue Masters, followed by PhD and a career in Industry, Research or Academia. You may even pursue MBA after B.Sc., and enter the world of Management and Corporates. Incase interested in Computer & IT Industry, after B.Sc. you may pursue MCA from some of the Good NITs and Central Universities leading to a strong career in the IT/Software/Services Industry.

Hence, B.Sc. in Subject of Interest is a good option after 12th, apart from Engineering.