Although I am not the one who improved within a few days

, I hope the following might help:
MSR -
1. You don't have to go through everything. The goal is to get a gist of what data is given and where. This saves a good amount of time. So you should be taking 2-3 mins to go through the given data. You can always come back to the relevant data when solving the questions.
For example, if the text is, read through it. Don't have to memorise details. If a graph/table/any figure is given, understand what they are about, like reading the axes, picking one single data point to get an idea, etc., instead of having to go through every data point, and so on.
2. Make note of only important points(cause writing takes time), which you think you might miss out.
3. Coming to questions, reading precisely is very important. If you can't seem to wrap your head around the question, don't waste time. Mark it and come back later if time permits.
4. Also, in certain questions, you have to quickly figure out if you need to check for all cases manually or if estimation/eyeballing works. Based on that, you can work towards the solution.
TPA-
1. The question stem, which describes what the question is asking and how to mark the answer, is very important. If we don't read it correctly, one can end up marking the answer for b:a ratio instead of a:b ratio.
2. Any sort of diagrams helps greatly. Look towards visualizing the scenario.
3. And TPA is known to have time-sink verbal questions, which need you to recursively test options. See if you can quickly identify them and check if you can answer them in 2.5 mins or so; if not, it is not worth it.
4. Also, learning about necessary and sufficient conditions can greatly help.
temporeincidunt
Anyone who has successfully improved efficiency in MSR and 2 part reasoning within just a few days, have the exam but struggling with the accuracy.