i am not an expert but from my preparation i know that DI is a mix of quant and verbal at the minimum, so doing well in fundamentals for quants and verbal is necessary..after that the nuances of approaching DI section should be worked on...for verbal i felt so far, the best is top 1%, for quant, best aproach by working on fundamentals taking gmat club quiz on weakest section..i found the streaks method by Murray to be useful in this...also look at showrtcuts and approaches by differnt experts and use the process to minimise time spent...HR1212 has preparation sessions..you can join and learn along..i missed the timeline but perhaps it ll help you..all the best! happy to help if you have any query..feel free to DM