Try your best and be confident in yourself because I know you can do it. if you have struggle maybe ask the teachers for help or your learning coach ( aka parent or garden ) And if your still having trouble maybe practice. Maybe even use a calculator on somethings and look up Calculator.net because it has math calculator science calculator and even more. And maybe even get a tutor online!
I would tell them to try their hardest and to not give up hen it seems hard. Also I would tell them that if they need help they can ask for help from their teacher, parents, or friends if they do not understand what they are learning.