SAT prep SOS

Do you think that Khan academy’s tests are good enough preparation for the exams? I live in a different country and here we dont take SAT exmas, thus i dont have any idea what the level of difficulty of SAT is. Ive been recommended this site. Does someone know if the real exams are on that level?

Khan Academy’s tests are exactly like the real SAT as all of them are created by college board and some were actually administered.

Thank you so much!