Is he applying for an SA or ROTC scholarship? If it is an SA than the DoDMERB portal will open up usually when they become a candidate. They will tell you the doctor(s) that you can go to for the exam. You state you live overseas, are you military? If you are and they send to docs on the economy, you can request it to be done at the base/post. It might also be that they are under review because they use specific doctors, so they might need to find the qualified doctors in your area on their list.
If he is doing a ROTC scholarship than they will not open up the DoDMERB portion until awarded the scholarship. I am assuming since you said CFA, it is an SA, but 95% of all SA applicants will apply for ROTC scholarships as plan B. The important thing to understand is that he will not have to do 2 DoDMERB exam, but the results will be sent to 2 different review boards because they are different commissioning sources.
For example: USAFA may Q your DS, but AFROTC may DQ or request a remedial, or vise a verse.
Same is true if he is applying to multiple SAs. Each branch has different standards.
~ IOWS, he may Q for USAFA, but DQ for USNA and a remedial requested for USMA.
All DoDMERB does is follow the regs set by each commissioning source. The commissioning source will be the one that determines to waive a DQ.