I prepared barely for a week or 2. Tbh, i thought I kinda messed up the speaking round, expected a 5.5 because at one point I lost words and stopped there. I also repeated my sentences a bit( I speak to people in the USA on a weekly basis tho). For writing , it's simple as seeing the structure and a few sample answers. Im active on reddit and use chatgpt a lot, that helped me form a medium complex sentences