How many questions can you miss on a 13 question test to make a 90 percent?

Answer 1

Assuming you get full marks for ALL the answers you give the 90% of 13 = 11.7

As you can not answer just 0.7 of a question you would therefor have to complete 12 of the 13 questions to get 90%.

However, it is very unusual to get full marks for every question you answer and this means that missing out just ONE question will probably cause you to fall below 90% of the marks available.

In general, in an exam it sis BEST to start by answering all the questions and then if there is time improving the answers for the questions you know most about.

This is because most of the marks are obtained by the easiest things you know about the question's subject, with the final marks being assigned to the more esoteric points.

Therefore good exam technique is to go for the most (easiest to get) marks first then put the effort in to obtaining the more difficult marks.