I'm currently preping for MBB/T2 case interviews and would like to know how to improve the following math skills

- Problem structuring, such as how to set up the equation to solve when given a bunch of information (currently going through Insead case book and doing the math but wondering if there are more effective ways or better case books to do this to)
- Mental Math
- dividing by two digit numbers e.g. 4094/63
- multiplication with large numbers 156 x 982 (is this even necessary or should 2x2 be sufficient?
- dealing with large number of 0s, sometimes I am able to divide the number correctly in the above examples but I don't know how many digits to actually put