For the reading section, you will read either 3 passages or 5 passages. Why the difference? If you get 3 passages, all 3 will be scored. You will get one hour to complete the 3 passages. However, if you get 5 passages, only three will be scored. The other two will not be scored. They will be used for other TOEFL tests. Also, you will not know which of the 5 passages will be scored.
Is this fair, completing two extra reading passages and not getting scored - and getting really tired reading 5 passages for an hour and a half? No. The Pro thinks ETS should stop experimenting on test-takers. Test-takers are not paying ETS $170.00 so they can be used as laboratory mice by ETS. Should you complain? Yes. Loud and often.
The Pro