Hello Ashu Nayyar, 

Yes, you can still go to Canada for your higher education. You will need to give international recognised examinations like SAT or ACT, and TOEFL or IELTS in order to be eligible for admissions. Since you are from the science stream you might even need to give the SAT Subject Test.

These examinations test you in the following parameter - english, mathematics, science, social sciences, humanities, listening, speaking and writing.

Scoring good in these examination will not only increase your chances at getting into top notch universities but also help with getting good grants and scholarships.

1. For testing English:

• Test of English as a Foreign Language (TOEFL) for countries like USA and Canada.
• International English Language Testing System (IELTS) for countries like UK, Australia and New Zealand. 

2. Testing of other parameters:

• SAT - It tests you in critical reading and comprehension, mathematics and Writing.
• ACT- It tests you in english, mathematics, reading comprehension, grammar, science with an optional writing section.

3. SAT Subject Test:

• Since you are applying for science related subject you will need to give an additional SAT Subject Test in subjects you want to pursue your Bachelor's in (eg. you want to pursue your Bachelor's in Biology so you will subject test for biology). 
• These subject tests will test your knowledge on whatever you have studied till 12th grade.

As a science student the courses which will open up for you are as follows:

• You can apply for a degree in forensic sciences. You will develop your understanding of biology and chemistry, forensic evidence, DNA interpretation and analysis. Your specialization will include fire investigation, crime scene investigation, forensic biology, chemistry and toxicology, observational psychology, laboratory analysis.
  You can apply for food science degrees. You will learn about science and technology, biology, chemistry and their applications in the food industry. 
• You can apply for a degree in environmental science. You will cover topics like geography, biology, geology, sustainability, biodiversity and ecology. Your specializations will include marine science, environmental issues, sustainable development, renewable resources, climate change, waste management, environmental management.
• You can apply for a degree in individual subjects like physics, chemistry and biology. The course will further improve your understanding about these subjects and provide you to practically experiment and validate your knowledge.
• You can apply for a pre-medical programme abroad too. It will give all necessary knowledge in order to successfully rise in the outside world. They will provide in depth knowledge about your specializations.

All the best!

I hope this answers your queries.

Do revert back in case of any further doubts.

I have scored 80% in compartment