The novel "Reach for the Top" by Santosh Yadav tells the story of Marai Suyambu, a young girl from a small village in Tamil Nadu who faces various challenges and harassment from her seniors at school.

The harassment faced by Marai is primarily from her classmates who are senior to her. They subject her to continuous teasing, taunting, and bullying. They make fun of her village background, her poverty, and her inability to speak in English fluently. They also belittle her dreams of becoming successful and achieving great things in life.

- Teasing and Taunting: Marai's seniors often tease her about her village background, imitate her accent, and make fun of her lack of proficiency in English. They use derogatory language and constantly belittle her.
- Bullying: The seniors also engage in bullying behavior, both physical and emotional. They push her around, snatch her belongings, and spread rumors about her.
- Isolation: Marai's classmates intentionally exclude her from group activities and avoid interacting with her. They isolate her socially, making her feel lonely and rejected.
- Academic Pressure: Marai's seniors also put immense academic pressure on her. They deliberately withhold information, refuse to help her with her studies, and undermine her intellectual capabilities.

The outcome of this harassment is that Marai feels demoralized, loses confidence, and becomes disheartened. She starts questioning her abilities and dreams. The constant harassment affects her academic performance and overall well-being.

However, as the story progresses, Marai finds support and encouragement from her teacher, Mr. Kishore, and her friend, Raji. They help her regain her confidence and inspire her to overcome the challenges. Marai's determination and hard work eventually pay off, and she proves herself by excelling in academics and extracurricular activities. She becomes a role model for other students and gains respect from her seniors.

In conclusion, the harassment faced by Marai from her seniors in "Reach for the Top" includes teasing, taunting, bullying, isolation, and academic pressure. This harassment initially affects Marai negatively but eventually, she rises above it and achieves success with the support of her teacher and friend.