This is really bad advice and is patently untrue. Harder questions are, in fact, worth more than easier questions.

The following is directly from the AICPA: “Multiple-choice testlets vary in difficulty—there are two levels that are labeled “medium” and “difficult.” Within the testlets, items often vary substantially in their difficulty levels, but across testlets, those labeled “difficult” contain harder questions on average than testlets labeled “medium.” Every candidate receives a medium testlet first. Succeeding testlets can be either medium or difficult, depending on a candidate’s performance (for more information about multi-stage testing, see FAQ #3, below). The scoring procedures take the difficulty of all questions into account so that candidates are scored fairly regardless of the difficulty of the testlets they take. “