Calculating an SAT II chemistry score?

Question

I took a practice test, and I missed 17 out of the 70 multiple choice, and also got five of the bubbles wrong on the other part. There are 15 questions there, with about three bubbles per answer, so is that 10/15 correct? Also, does anyone know what my SAT score would be if my raw score (adjusted if I just consider each bubble error to be worth one) is something like 57/85

Answer 1

730 is your score if you left 17 black

17x .25= ?

Answer 2

There's two things that matter for estimating your converted score: the number of questions right and the number wrong. The raw score is # Correct - (1/4) * # Wrong. I'm not sure if by "missed" in your first sentence you meant 'wrong' or just 'unanswered'. I'll go with both.

The 'other part' is a true/false section with 5 possible answers for each question. You got 5 wrong, and they are worth as much as the other multiple choice questions.

The highest score you can get, which would be if you happened to miss 17 questions and not answer them at all, with 5 wrong, is: 63 - .25 * 5 or 62.75 which rounds to 63. According to my book (though other books estimate on a steeper curve than mine), a 63 converts to somewhere near a 740.

If you got 17 wrong in one section and 5 in another, then that's a total of 63 - 5.5, for 58, which rounds to a 710 or so.

Assuming by 'missed' you meant wrong and blank, then I'll average 8 questions wrong and 8 not filled in. so that's 13 wrong and 63 not right... 63 - 2.75 is about a 60, or about a 720. This is based on the scores in my Barron's book, but my friend has books which say that those scores could be 20+ points lower.