Old good VK surfing. I remember how often I used it during my school years. In a month, it was easy to accumulate 500 rubles to later transfer to my phone. Completing tasks takes almost no time, and there's nothing complicated about it. However, they only pay 10 kopecks for such tasks. After school, I kind of abandoned this activity. It's better to find a decent part-time job than to like posts for pocket change. I gave my account to my younger sister. She occasionally completes tasks and withdraws the money she earns, so the site continues to operate and pay. This is suitable for school students, but I wouldn't recommend it to others.
