Seventy correct answers do not necessarily mean 70 net marks. When wrong answers carry a penalty, their deduction must be subtracted from the reward earned by correct answers.
The Negative Marking Score accepts the question count, correct answers, wrong answers, reward per correct answer and deduction per wrong answer. Unanswered questions are treated as zero under this model.
Read the paper instructions before entering a penalty
Set the reward and penalty to the values stated for that particular paper. Do not assume every entry test deducts marks, or that every deduction is a quarter mark.
The model gives every question the same reward and penalty. If sections have different marking rules, calculate them separately. It does not award partial credit for written answers.
Correct and wrong answers together cannot exceed the total number of questions. If they do, revisit the counts rather than increasing the paper total to make them fit.
A score of 65 from 90 attempted questions
For a 100 question paper, enter 70 correct and 20 wrong answers. With one mark for a correct answer and a quarter mark deducted for a wrong answer, the reward is 70 and the deduction is five.
The net score is 65 marks. Ten questions remain unanswered. Attempted answer accuracy is 70 ÷ 90 × 100, or about 77.78%.
Accuracy describes the share of attempted answers that were correct. It is not the percentage of the maximum paper score, which is a different measure.
Two boundaries worth checking
If no questions were attempted, attempted accuracy is undefined. The tool leaves that metric out rather than dividing by zero or calling the accuracy 0%.
A sufficiently large deduction can produce a negative net score. This calculator retains that negative arithmetic result. If the examination applies a minimum score floor, confirm and apply that official rule separately.
Use the score for practice, not certification
Counts from an answer key can help compare practice papers using the same marking scheme. Verify disputed answers and use the final official result where one has been issued.
For a fixed planned attempt count, Correct Answers Needed shows the minimum correct answers needed for a chosen net score. Neither calculator estimates the chance that an uncertain answer is correct.
Keep the reward and penalty visible when sharing a result. A raw count of correct answers can otherwise be mistaken for a net mark total.