I started with self study which I found time-consuming so I tried an online tutor who planned the whole these 9 months for me. The first 6 months I studied french in general using different books among which I found CLE books very helpful. Then 3 months of intensive work for the exam, actually she had prepared some sample questions and tests for CO and CE skills which were very similar to the exam and helped me to achieve two C1 in these skills. For the two other skills we worked on exam topics and some techniques to manage them. That was really useful and I believe for such a short time it was the best way to go.
Could you please inform on a reliable site or such to find an online tutor? Thank you in advance.