The diagnosis is usually made when school starts, around 6-7 years old, especially when school adjustment problems arise. Warning signs vary depending on age, but some of them are:

• Notes in the diary are frequent.
• He often doesn't finish his homework, and it's disorganized and full of mistakes.
• In class he speaks impulsively, answering before the question is finished.
• He is aggressive and has difficulty accepting rules.
• At home he has difficulty performing tasks, although his performance improves with supervision.
• In their relationship with the group, they tend to be bossy and dominant.
• He doesn't respect the game's turns.
• They are restless and prone to accidents.
• The school report contains phrases such as "is easily distracted", "often interrupts the class", etc.