I studied for 4 months using the GARP Core readings and BT for the two levels and was well prepared for the exams. I thought BT had great videos, challenging sample questions, and a very active and supportive forum. The BT notes are available online, but you can print them if needed.
I didn’t use the Schweser products for the FRM program. If you do a search in this forum will find that the majority of people used Schweser and passed the exam. So, it depends on what works for you. In my opinion, if you have the time use the GARP readings to learn the material more thoroughly. Good luck!