Yes, a DET score of 135 is quite good. It is ranked among the top 10% of all Duolingo English test takers. This score suggests that you have an exceptionally high level of English proficiency and can comprehend and communicate well in a range of situations. A score of 135 is significantly higher than the minimum required by most colleges and other organisations that take the Duolingo English Test (DET). In fact, for undergraduate and graduate applications, many colleges consider a score of 135 to be a significant indication of English language competency.