Find the number of questions you got wrong on each section and multiple it by 0.25. Write this number down with a heading above each number labeling the section. For example, if you missed eight questions in a section, multiply 8 by 0.25 to get 2.
Subtract the result from the number of questions answered correctly each section. For example, if you got 12 questions right, you would subtract 2 from 12 to come up with 10.
Print the conversion chart from the FCPS site and use it to convert the raw data from the last step into the estimated score for each section. Make sure it is within the range of 20 to 80 or you haven't done your earlier calculations properly.
Add the results from each section to get your total score. Make sure your score isn't under 60 or over 240 as these are the minimum and maximum scores for the test.