> what is lse?

London School of Economics [1]. Prestigious British school, largely only relevant, outside the U.K., to economists and financiers.

[1] http://www.lse.ac.uk/

> what is lse?

The school that Mick Jagger went to. https://en.wikipedia.org/wiki/Mick_Jagger

Oxbridge is a portmanteau of Oxford and Cambridge. In the UK it's a term often used to refer to the universities - which are routinely ranked as the top two universities globally.