Shall we have to give all the seven tests which are conducted by the SAT in a year.

Hi Ayush...

There is no restriction in taking the SAT scores for all the seven times.

Many schools allow you to use Score choice, or to pick and choose which scores from which test dates you want to send as part of your college application.
Not all schools support the use of Score Choice, however, and they take it on good faith that you'll send all your scores . Some notable schools with a "send all scores" policy include Yale, Stanford, Cornell, Carnegie Mellon, and the University of California.
So if you can use Score Choice to send only some scores and keep the rest private, and you have the time and money to keep retesting, then technically you could take the SAT as many times as you want. But if your schools don't use Score Choice and you are expected to send all your test scores along with your application.

If you're applying to schools that require all scores, like the ones mentioned above, I would recommend not taking the SAT more than 6 times. If you take it this many or more times, you might be sending the signal that you're not taking the test seriously enough to prep each time or that you have a lot of trouble improving your scores. The SAT is meant to test all students on a level playing field and determine their readiness for college, so it wouldn't look all that strong to have to take the test more than 6 times to perform well.