Extroverted students tend to perform better during lessons focusing on remembering and understanding, while introverted students may perform better during applying and analyzing phases of lessons. Younger shy children express shyness through nervousness and fear around new people and situations, while older shy children may feel embarrassment and self-consciousness when the center of attention. Educational programs for intellectually gifted students include enrichment classes, after school programs, and mentorship opportunities to keep them challenged at their level. Recent studies show acceleration does not harm children academically or socially and may increase their enthusiasm for school. Some students have uneven skills across subjects due to conditions like autism or ADHD.