Ranking seasons based on how important they are to watch before Second Chances. Mostly based off of how many people from these seasons are competing, and who is the most important to the season in Cambodia. I will just leave the list without reasoning in fear of spoiling any of these seasons
12. Survivor: China
11. Survivor: Samoa
10. Survivor: Panama - Exile Island
9. Survivor: Pearl Islands
8. Survivor: Borneo
7. Survivor: Blood vs. Water
6. Survivor: Tocantins
5. Survivor: Philippines
4. Survivor: Worlds Apart
3. Survivor: The Australian Outback
2. Survivor: Cagayan
1. Survivor: San Juan del Sur
Keep in mind that Survivor: Cambodia will spoil a lot of, if not all, of these seasons. However, if you only intend on watching a few seasons beforehand, I think that this list is a good one to follow.