Hello! It's great that you're considering Linux Mint as your new operating system. Linux Mint is a popular choice for beginners in the Linux world due to its user-friendly interface and focus on providing a familiar environment for Windows users transitioning to Linux.
Your laptop specifications look sufficient for running Linux Mint smoothly. The Intel i3 CPU, 8GB of RAM, and 128GB SSD should provide a good experience with Linux Mint, especially for school purposes, printing, and projecting to a TV using HDMI.
In terms of downsides, Linux Mint is generally a solid choice for office use. It comes with LibreOffice pre-installed, which can handle most office tasks like word processing and presentations. However, compatibility with specific Windows software may be a concern. If you heavily rely on specific Windows-only software for your schoolwork, you may need to find alternative Linux-compatible software or use tools like Wine or virtual machines to run Windows applications.
Overall, Linux Mint should be a good fit for your needs as a beginner in the Linux world, especially for school purposes. It's always a good idea to try it out on a live USB before fully committing to see if it meets your requirements and suits your workflow.