If I were in my second year of high school… the current math and science foundation would not be sufficient to understand specialized books related to communications.
If you're interested in radio, I recommend a few books related to electronics, such as Charles Platt's "Loving Electronics," which is a good introduction to electronics. For microcontrollers, you can check out Du Yang's book, or simply buy an Arduino and follow online tutorials to experiment with lighting. As for amateur radio, the "业五" (or "业六") magazine is a classic choice, although it may not have the latest legal information.