The top undergraduate in the Cambridge mathematics degree is referred to as the senior wrangler. Some people who did not make senior wrangler when they sat the exam - James Clerk Maxwell, Bertrand Russell, John Maynard Keynes, J.J.Thomson (discover of the electron), Lord Kelvin. So you can see the level we're talking about here.
Cambridge did not admit or award degrees to women in the 19th century, but did permit them to sit exams. In 1890, Patricia Fawcett received the highest mark, but was not told what it was - merely that she had placed above the senior wrangler.