You should probably spend it on things that give you good experiences that will improve you and that you will remember throughout your life. Going to see shows, joining activities such as martial arts (I favor Capoeira) or juggling or something can give you fun skills you can use indefinitely as well as introducing you to large amounts of potentially awesome people. Not only are friendships and relationships super important for long-term happiness, spending money on experiential things as opposed to possessions is also linked to fonder memories etc. If you want to buy toys, I recommend spending money on things you will use a lot, such as a new phone, a better computer, or something like a kindle. In general I approve of saving behavior but to be honest the money you make tutoring kids is not gonna be a super relevant amount for your long-term financial security.