Just reading won't get you through the ATPL, you must make notes of the key facts. Writing helps to get things into your subconscious where things will slowly begin to click.
Subjects like MB, GN & FP are also the more practical ones so you only really learn when you DO things. Other subjects like Air Bore is just remembering facts as best you can.
Your number one priority is to master the CRP-5 particularly on the wind side and working out TAS given IAS/Mno etc. Start doing this NOW as it will save you valuable time you can use towards other areas.
Though it might sound somewhat old-fashioned I advise my students to get some blank post/cue cards and write all the formulas (included transposing it) for each subject - there will be several.