Wolves followed up wins over Manchester City, Liverpool and Chelsea by shattering Manchester United's unbeaten league record on Saturday at Molineux.
Such results are in complete contrast to their form against sides in the lower part of the table.
Defender Berra said: "This season has been crazy so far. We get beaten by the teams around us and then beat Chelsea, Liverpool, Manchester City and now United.
"It was a great result for us at the weekend. But now we have got to make sure we do the same again against the so-called smaller teams."
Wolves face another daunting challenge at Arsenal next weekend, but Berra said: "We are more than capable of going there and getting a result."
Source: PA
Source: PA