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Content jump from undergrad to graduate level economics.

Having gone through various modules taught on several MSc courses in economics, and having a look at the recommended texts, it seems like there is a considerable knowledge gap that id be missing when i graduate in the summer. Mad-Colell Microeconomics for example is written in a style that isn't even remotely understandable for me, using real analysis etc. Despite having done various math components in intro/intermediate/advanced undergrad modules, it doesn't seem like the masters courses are an obvious next step having done a bachelors, more like a leap into a pure mathematics course with the word 'economics' thrown around.

This is more of a discussing than a question, but i'd love to know anyone who can relate.
More generally, i'd love to hear from anyone on an Msc economics programme and their experience with the expected work load and how they prepared for starting the course.

Thanks everyone.