People with dyslexia usually cannot organize themselves. They cannot prepare a schedule, which makes them frequently late and lost in the duties. The rooms and working places of such patients are extremely chaotic, dirty, and messy. They always require help when cleaning up as they do not know how to allocate/arrange things to find them later easily.
Sure thing, many students get F on their homework tasks and tests. However, if the reason is not laziness, lack of time, or refusal to do the task, it may be the symptom of dyslexia. Often, such patients have a desire to study, but they just cannot make it through. The obstacles such as lack of reading and writing skills prevent them from high academic achievements.