In algebra, like every topic that is covered in GCSE Maths, there is a set method that you should follow and this will always help you to solve the question. The complicated algebra questions are ones that take the simple methods you have already leaned and mix them up to include more steps, which is where a lot of students make mistakes. For example, in a complex algebraic faction addition the first thing you have to know is how to add simple fractions (LCM), followed by any opening the brackets (if necessary), adding up the terms and then cancelling out terms to simplify.It is important to find out where you are making mistakes in this process and from that figuring out the best way to rectify them. As a student who went through having the same issue, it was only by seeing in detail about this that helped me to move onto more difficult complex questions.