It seems like there is no official website for the International Chemistry Olympiad! All the information (problems from previous olympiads, solutions, results, etc) are available for each year on a different website specific for that year.
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Links to all the previous IChO websiteby Keshav Dhandhania
Since there is no official website for IChO. All the information and past problems and solutions are available at the websites for each individual year. Here is a list of all the available websites:
[PowerPoints] General Laboratory Skillsby Keshav Dhandhania
The following PowerPoint files cover general laboratory skills that students participating in IChO should be familiar with. Specific equipment details will vary, but the operating principles will be the same.