Do you think it's a good idea to apply to several projects on Appen?

Hi! I applied to Santiago and passed it. I also opened a Payoneer account and signed virtually some documents.(related to the project). Now I'm waiting. Should I apply to other projects and do the exam or wait? I'm just afraid that I might enroll myself in several projects at the same time and thus not be able to handle them all. What do you think?