You can apply China visa in Feb or March through Chinese embassy in your country. And you are Philippine passport holder, right?The other documents you need are return ticket, hotel reservations, and sometimes, travel funds are required. If you are going to apply in Saudi Arabia, you also need residence permit/valid visa there. But if you apply in Philipines, please refer to this link: the requirements for China visa application(https://www.travelchinaguide.com/embassy/visa-application-philippines.htm) .