So, I have been preparing from Schweser 2014 material. I know there have been changes in CFA curriculum with respect to FRA and Derivatives. I have read these topics from CFA curriculum. I forget some formulas when some weeks pass by of revision and this is bugging me. Is anyone here feeling the same or is it only me?

With so much material to master, it is natural to forget bits and pieces. That is why reviewing the entire curriculum is really important. If you do all EOC problems and several practice exams, that should help you consolidate the material.

You could also try making your own formula sheet.

BullishBear Finance