His attitude towards learning can be a big part of the redemption theme. Instead of using his skills for bad, like he did in the gangster world, he starts to apply his determination and focus on his studies. He may have a goal of getting into college or simply bettering himself. This transformation from a life of crime to a pursuit of knowledge and self - improvement is a strong indication of his redemption.
One interesting plot point could be the initial culture shock. The gangster is used to a rough and violent world, but high school has its own set of rules, like social hierarchies based on popularity rather than power. Another point is how he might use his street - smart skills to deal with bullies. Maybe he doesn't tolerate their antics like the other students and stands up to them in his own unique way.
There was a gay high schooler who was bullied a lot at first. But instead of letting it break him, he used his art. He painted murals around the school that depicted different forms of love and diversity. His art started conversations, and gradually, people who used to bully him began to see him in a new light. Eventually, he won an art competition which also helped to raise the profile of the LGBTQ+ community in the school.
One theme could be redemption. The gangster has a chance to start anew in the high school environment and leave his criminal past behind. Another theme might be identity. He has to figure out who he is now, is he still the gangster or can he become a regular high school student.
In a more complex plot, the gangster - turned - high - schooler could be on a mission. Maybe he's trying to find something or someone in the high school, and this is related to his gangster past. Along the way, he has to deal with the normal high school stuff like exams, clubs, and relationships. His old gangster instincts might help him in some situations, but also get him into trouble in others, like when he gets into a fight with a rival group at school because he misunderstands their intentions.
It is extremely inappropriate. There are many potential consequences. Firstly, it can cause serious physical harm to the body. Secondly, it is a very unethical and abnormal behavior that goes against social and moral norms. And it may also lead to psychological problems for the individual in the long run.
One such novel could be 'XXX' (if there is a known one). In this type of novel, there are usually a lot of interesting plot twists. The gangster's past experiences would contrast sharply with the innocent and studious environment of high school. It might explore how he tries to adapt to the rules and social norms of school while still having his tough - guy instincts.
It could be a tale of transformation and adaptation. Maybe the gangster has to deal with a completely different social environment and learn new rules.