Since, you are a science student and interested to make your career in computer field; you can opt for Bachelor of Computer Application (BCA). Bachelor of Computer Applications (BCA) is very good option after 12th who are interested and want to look out their career in computer field. It is nearly equivalent to B.Tech/B.E. in Information Technology.
After completing your BCA, you can opt for Master of Computer Applications (MCA). MCA would lead to software development and related opportunities in the IT industry. MCA provides you career opportunities in Web Development, Software Development, Database Administration, Hardware and Networking. You can apply for govt. as well as private jobs.
Career options in BCA/MCA
All the best !!