Computer Science C# help

Hi I am currently self learning A level computer science planning to take the exam in 2026 May at my school. The school offered me resources to help but that is during school. How can I learn C# on a more advanced level in preperation for the exam. I found a website that gives coding questions and there are solutions but is there a good course to follow as well that teaches more advanced functions. I would prefer if it was free. Thanks !!

Coding is not about hitting the mark scheme. It is about solving problems. If you are presented with a problem, you should know if your solution works because it solves the problem. In industry we are presented with problems. There is no mark scheme. We make the software and if it solve the problem, we get paid. So go through the problems. If you are presented with a problem that says print out every third letter of a sentence, if your solution does that, you got it correct! Don't overthink it. If it works, well done. If it doesn't work - try again!