IPO

Students competing in the Olympiad are given four hours to write a philosophical essay on one of four topics given. The topics are provided in the four official languages of the IPO - English, Spanish, French and German - and the student must choose to write one of these in a language other than his/her own; that is, a native French speaker would not be allowed to write in French. There are five criteria of evaluation.

1. Relevance to the topic
2. Philosophical understanding of the topic
3. Coherence
4. Power of argumentation
5. Originality

The materials for this olympiad although many countries dont even participate in this olympiad as of now  ...https://drive.google.com/drive/folders/18lgXo_vpnYKnEUQ_VSOdlRSZ_j0t2QNz

You can prepare from this blog for the country India http://reason.abhinav.ac.in/ or you can check out other countries resources as there is less known about this olympiad.

You can check if your country participates in this olympiad https://en.wikipedia.org/wiki/International_Philosophy_Olympiad.

All the best!