Incoming G-11 STEM student !

Just a few more weeks til I finish junior high. I've been thinking about what to do in STEM strand. Based on what I heard, this strand is difficult. On the other hand, some say it's easy, as long as you're good in major subjects ( Math, Science, and English ) Perhaps, I'm scared of the possible outcome of choosing STEM as my strand. Please, help me out. I honestly don't know what to do.