It seems you had PCMB in intermediate. After 12 PCMB you'll have a lot of options in front of you, be it medical or engineering or any other. The list is never ending. Courses after 12 science with PCMB, you can appear for NEET if you are interested in Medical line, especially MBBS. You need to appear for Neet and there is no age limit as of now so you can appear for that. There are also para medical courses, and BSc Nursing and Bachelor of Physiotherapy are best courses. If you are interested in engineering and architecture, then you can appear for Jee or any other engineering entrance exams. Now you cannot appear for Jee Main as there are some passing criteria and cap of number of attempt. But state level Engineering Entrance exam has less criteria on age. So you can appear for that. Other career options are available for 12th passed science students. The best part of science stream is that students can switch to other careers i.e arts, humanities or even to commerce. You can also go for Hotel management which has a good scope nowadays, also can move up to CA or CS Program.