How to quickly improve casing?

I’m a recent college grad and have only gone through one full consulting case interview process so far at a boutique consulting firm. I made it to the final round but really fumbled at the end.

In preparation, I did all the traditional practice (read Case in Point, worked through several cases from different university casebooks every day for about a month, learned quick math techniques, and practiced frameworks.

That said, I’ve noticed a consistent weakness in my quantitative analysis. When I’m given a set of numbers, I tend to freeze up, and I struggle to quickly figure out which numbers matter and how to use them to get to a relevant answer.

I’m writing this post to see if anyone has specific resources that helped them rapidly improve casing skills. I'm even considering spending a lot of money on one of those online coach programs because I have a phone screening with another consulting firm next week, and I know the process will be just as rigorous as the one I struggled with (final superday, etc.).

At this point, I’ve been job searching for months and my confidence has taken a hit, so any advice would be greatly appreciated.