There are tons of IB websites out there that sell you things, I would not pay for anything because you can truly get through without buying any subscription in my opinion.
Here are the websites I actually used and found helpful:
- Calculate my grades- prediction and better understanding of points/ papers and expectations
IB Grade Calculator
- Coursework examples- find how model essays look like
Clastify - Write Excellent IB Coursework & College Essays
- Past papers archive- this was a life saver please download all the papers you can ASAP!
index - IB Docs Repository
- For specific advice and community- look up questions and what others are thinking
International Baccalaureate