I got an A* also. If you aren't aware of Econplusdal, get on his YT! He's so popular among students that he is no longer an advantage to know of, it's more of a requirement to pass lmfao.
My essay structure depended on how easily I can flow from pros and cons of the side / the type of question. Sometimes: small intro, pro, con, pro, con, conclusion. Sometimes: small intro, pro and con of policy 1, pro and con of policy 2, then a conc which tied the two together.
It depends. But best advice is to practice essays from early on. Don't waste time fully writing them out, just write detailed essay plans