Why do students stop showing up at Ender's extra practices?

Students often stop attending Ender's extra practices due to a combination of factors, including burnout from the intense training regimen, a lack of immediate visible improvement, or feeling overwhelmed by their other responsibilities. Additionally, some may feel that the extra practices are not benefiting them as much as they hoped or may be discouraged by the competitive atmosphere. Social dynamics, such as peer influence or feelings of inadequacy, can also play a role in their decision to disengage.