SAT

You should try it as the application process for admissions starts in fall mostly and u hv chance of taking it twice to make your score better. SAT score is valid for 5 years though.

So the obvious answer is - No, you cannot pursue higher studies in US without SAT. Additionally you must also take TOEFL. There are no relaxation in case of SAT requirements.

Hi Himanshu,
To appear for the SAT, you must register firstly through the SAT official website:
https://collegereadiness.collegeboard.org/sat
Start preparing if you haven't. You will find all available test dates on the website.

Hi
SAT and ACT are both the standardized test for admission in US. While SAT is more famous in India, ACT is actually better to score high provided you prepare well for it. You may choose one or both as the colleges in USA pick up your score directly from the organisation.
I would suggest you to take a mock test for both and then decide.

Hello, identifying your strengths and weaknesses is important, while you work on your weak areas also keep working on areas you are confident in.Preparation level vary from individual to individual. Suggest you to take mock tests as you will get to know your scores and improvement areas. The more mock tests you take the better. Devote time to studies based on these mock scores.
Regards

You hv the option of taking ACT or AP as well. With SAT, you hv the option of SAT subject based test to make your profile better.
Other than these, the mandatory one is TOEFL or IELTS to show your proficiency in english.

Dear Raunak,
This matters on how you can cope up. Apart from the preparation I wonder if you are taking the mock tests, take the mocks as much as you can, the mock scores will help you understand where you currently stand. On the whole depending on your scores and improvement you require you may devote 2 to 7 hrs a day or higher. You may combine the SAT preparation alongside your boards.
Best wishes

Dear Rinku, she will find a number of opportunities in UK, she needs to visit university websites for program offerings to suit her subject combination. Compared to Singapore, UK has a wider audience and prospects. Biomedical engineering, biotechnology, biomolecular sciences, biostatistics are some of the very happening topics. A bit of research needs to be done by herself. You may check completeuniversityguide uk for reference.
Best wishes

Both SAT and subject tests are required for ivy leagues.

Hi
You may take SAT twice but it is advisable to do so only after the best preparation. The score for it is valid for 5 years so do not attempt in a hurry. You will get all the latest info about it at the following link.