Consulting Prep Timeline

My 2 cents as someone who got an MBB FT offer this cycle, and got consistently great feedback on my cases from my interviewers. 

There's no prescriptive method. Do it all based on feel. I started doing a few cases a week starting in June until I felt ready. I was really nervous/neurotic about this, so for me, "ready" was feeling like I had refined my toolkit to a point where I could reasonably work my way through any problem/case. It didn't mean I would know the answers to everything off the bat, but it meant that I felt I would have enough direction, structure/organization, and business sense to guide me to an eventual answer. Once I reached that point, I really just stopped casing. In the month leading up to my first case interview, I did not do any cases, and throughout the entire FT recruiting process (which took around 2 months for me), I did not do a single additional practice case, just live interview cases. Getting an offer is a combination of circumstance in addition to your preparation. Do everything you can to mitigate the risk on that preparation piece. If you truly get to a point where you feel well-equipped for any situation, I would say you have eliminated that aspect. For me, that took me this summer (a few dozen cases over a few months) but that was AFTER I had already had some substantial prep previously for internship recruiting where I read case books, did online courses, cased, etc. 

In terms of resources, by far the best resource I found for casing was the Crafting Cases free course. Stellar course + techniques, gave a very solid foundation which I refined and mastered, especially for structuring, which I found to be the hardest part of casing. Math was never really an issue for me, but I just did some online practice for fast math from time to time. Practice scenarios on Rocket Blocks were also helpful just to give you a diversity of situations you may encounter. I honestly find Case In Point pretty trash, especially their practice cases. 

What really took me to the next level was just incorporating some of this thinking/structuring to everyday things in life, and thinking about how I would approach this issue, and I would always come back to that to think about how I could improve that structure. I.E, I watched Ford V. Ferrari (awesome movie btw) and after, gave myself a scenario about advising company X on whether or not they should enter into a major racing competition. I made an initial framework and from time to time, went through iterations for how to improve that framework. 

Remember there is also behavioral portion of the interview which is crucial as well, in addition to getting the interview in the first place, so networking should also start in the early summer. Behavioral prep varies, I mainly just did that in the week(s) leading up to the interview. 

Hope this helps and best of luck