ACT

4-5 times in a year with a gap of 21 days.

Most of the scores are valid up to 2 years from the date you took the exam. Every country has different criteria and different requirements of the score for admission.

SAT and ACT are standardised tests which students need to take if they are planning to study in the US. Not all universities require SAT/ACT. You can take the SAT or ACT by creating an account on the respective website Collegeboard.org for SAT and ACT.org for ACT.

Both of these are the entrance tests for doing engineering related courses abroad. Please upvote if you found this answer useful.

Hi Swapnil,
I believe you are enquiring about scholarships. If yes, then please know that there is a difference between fellowship and scholarship. Be careful with the terminologies when you are applying abroad. Scholarships are on merit-basis, a high SAT or ACT score will increase your chances, however, not a guarantee. You must be a brilliant student overall.

Hi,
Start preparing your application process including taking these tests a year before the admission sessions. You can schedule the tests accordingly. Visit university websites for upcoming deadlines and prepare.