It is sad to see that you failed level 2 again, I can definitely feel your pain since I failed band 9 a few years ago. I finally passed this time round with a better strategy in my preparation.
For the notes, I sticked with schweser and always referred back to the CFAI official book for deeper understanding in some of the topics, especially in derivatives, fixed income and portfolio management. For example, I went through the entire derivation of FRA pricing and valuation in the CFAI book, rather than just memorizing the formulas and methodologies. Actually I spent quite a lot of time in reading the materials, trying to understand the underlying theories in every topic. (I am more of a theoretical person since I studied maths in uni)
For the exam preparation, I would recommend focusing on the practice problems inside the CFAI books since they cover every single knowledge point that will possibly appear in the exam.Indeed in the real exam a lot of the questions are similar to what I have encountered in the practice problems. I completed all the problems for equity ,financial reporting, fixed income, derivatives, alternative investments and most of the problems in economics, portfolio management,quantitative methods. I strategically gave up corporate finance since this is an old topic. I only had time to work on online topic tests for the last few days before the exam so I took priority on topics that I thought with more preparation, there would be significant improvement in my performance, which included portfolio management, alternative investments and economics.
Luckily my strategy worked and I passed! I did well in the topics that I focused on, getting >90% in financial reporting, fixed income, portfolio management and economics, 80% to 90% in derivatives and alternative investments, quantitative methods,except for equity though, which I got slightly less than 70%.
Good luck in your future preparation and feel free to ask any further questions. I am sure you can pass next year with hard work and determination!