Hello aspirant,

There are many options available for you after you complete your 12th with science stream. Some of the options are

• Engineering
• Doctor
• BBA
• Bachelor's in science
• Government jobs
• National defence academy

Some entrance exams for the following are

• Joint entrance exam (JEE)
• National eligibility entrance test (NEET)
• NDA
• UPSC

You can refer for more courses of your interest through this link

https://www.google.com/amp/s/school.careers360.com/articles/courses-after-12th/amp

I hope this information helps you.