There are many SAT test centers all over the world. Here you can find all places that offer the SAT.
On this site, you can see all the dates to make the SAT test and the registration deadlines.
The TOEFL test is offered more than 60 times a year by different test centers all over the world. Here
you can find all the test centers and dates.
In some cases it is also possible to take the TOEFL test online.
You can take the IELTS test at more than 1600 test locations all over the world. Here you can find
your nearest center.
You can make the DuoLingo test online, where and when you want!
Here you will find the dates on which the ACT tests will take place in 2021-2022.