Hi aspirant,

Since you have Physics, Chemistry and Mathematics as your subject you have a lot of options open. You can do NDA, Law, BBA, Merchant navy, BSc in various subjects and even Bachelors in designing or architecture. Since you also have computer science as your subject it is pretty much visible that you are interested towards software engineering and trust me it is truly a good option. Now since you are asking about how to make a career in software engineering, at first you need to get admission in a good engineering college that may be private or government but should provide good placements and have proper environment for studies. You would have to write JEE main or other entrance examination such as VITEEE, BITSAT, SRMJEE, AEEE, WBJEE.

Now if you are truly interested to learn it before college starts you can do it with free you resources available online and YouTube videos. You need not give a lot of time but make sure to practice daily.

hope it helps!