It is absolutely not possible to do the Selection Pool fully remotely. We strongly encourage you to be on campus for the 3 weeks. The peer-to-peer learning is essential to complete the projects, and many projects are done in teams. There is flexibility to do some learning remotely, but you will be at a disadvantage if you are not on campus the majority of the time.
Compulsory days that you must be on campus are each of the three Friday's, as that is when the exams take place, and the first Monday of the pool.