I took FAR in early January for the first time and failed with a 73. This was my first exam so I had taken and scheduled inefficiently resulting in about a month wait for my scores in which I had used the time to start studying for AUD. I studied for AUD usnig the following method and scored a 96 at the end of February. After taking my AUD exam I spent around 6-7 weeks re-studying for FAR for a mid-April retake using the same method I used for AUD and have noted below. I scored a 93 on FAR for my retake, raising my exam score 20 points. I used Becker for a primary course but I'd assume you can do the same with Wiley.
1) I didn't waste time re-watching videos, I don't retain much from them.
2) I read my personal notes from my previous exam while re-working ALL homework problems provided by Becker.
3) After finishing all homework questions in Becker I bought the Ninja MCQ and worked ALL Ninja MCQ questions to where I had seen every question once and then I continued to work troubled areas.
4) Copy and paste problematic questions into a running Word document that you can print and review during down time to help LEARN your weak areas.
5) Pay attention and place extra focus on the journal entries for EVERY MCQ that you work.
6) I used Ninja Audio for my daily commute to and from work, I believe it can really help. Ninja Notes are a good product if you don't have your own from your previous exam. Pay attention and learn why questions are correct AND incorrect.
7) Caffeine and confidence on exam day.
Also, I did not practice a SINGLE SIM during my re-study for FAR which might sound crazy because I BOMBED the SIMs on my first test. However, after bombing the SIMs on my first exam I realized how much luck was involved with drawing good SIMs on exam day and decided to place my focus elsewhere. If you can solidly answer all computational MCQs and write journal entries you should be able to work the SIMs.
If you put in the time I'm sure you could try to squeeze in both exams within 2 months but you'll have to really study. I'd personally probably cram REG first and try to learn it since it will be new material and take it ASAP and then cram your restudy and take it on the absolute last day possible.
Remember, check with your State board so that you know the exact dates you need to have taken the exam AND received the scores, each board is different.