Diagnostic Tests at C2 and others

Hi All! I took diagnostic tests at both C2 and IES test prep about a month and a half apart. I was trying to decide between the two. I know that every test prep center has a different difficulty level but there is a 100 point difference in my Math scores! My C2 Math test score was higher by 100 points. Which scores do I really believe? Also, how much can one trust these diagnostic test scores? Can you predict your actual SAT scores through these tests?

Theres official sat practice tests on the collegeboard website. These will probably be most accurate.

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Thank you! Will try those!