Reborn in the College Entrance Exam Hall, I Can Only Collect Scrap

He never expected that even after being reborn, he would do worse on the college entrance exam than in his previous life. So the only option was to deal in secondhand goods. Once he had money, he naturally had to get involved with smartphones and see if he could come up with a miracle cure for COVID-19. Of course, he'd have to throw money at it and give it a try... What if he actually succeeded? #HandwrittenByTheAuthor