Read the following passage and answer the questions that follow- Brain training is big business. From online websites to video games to mobile apps, it seems like there are plenty of ways to give your brain a bit of a boost. But does all this brain training really work? Can it increase your cognitive abilities or your IQ? According to a few recent studies, while these brain training tools might help sharpen your abilities to retain information, they won't necessarily increase your intelligence or improve your ability to reason and think abstractly. The parent company of one of the most prominent "brain training" websites was recently ﬁned for deceptive advertising. According to the complainant, the company suggested its games could reduce or delay cognitive impairment such as one might ﬁnd in Alzheimer's patients, which is false. So while there may be some beneﬁts to brain training, don't expect miraculous results. Earlier studies have found no link between increased intelligence and brain training exercises. Same is the case with standardized tests. Students today take a wide variety of standardized tests, from assessments throughout elementary school to evaluations required for college admission. While test preparation for such assessments can increase factual knowledge, one study suggests that this preparation does little to increase overall IQ. Why is it so? While test preparation increases what psychologists refer to as crystallized intelligence, it does not increase what is known as ﬂuid intelligence. Crystallized intelligence includes facts and information, while ﬂuid intelligence involves the ability to think abstractly or logically. In a study published in the journal Psychological Science, researchers looked at the IQ scores and test scores of approximately 1,400 eighth-grade students. While schoolwork helped increase the students' test scores, it had no effect on measures of ﬂuid intelligence. The authors suggest that ﬂuid intelligence is a much better indicator of abilities such as problem- solving ability, abstract thinking skills, memory capacity, and processing speed. While the study found no indicator that test preparation improved IQ, that does not mean that this preparation has no value. Research clearly shows that having high scores on standardized tests is linked to having high scores on other important tests including Advanced Placement tests, the SAT etc. What do brain training tools do?