Depends from prof to prof. For some, yes and for others, no. Try to see if the content of the lectures is similar to what the prof is teaching. If it is then dukki would be helpful for last minute prep, but don't depend on it too much as it can contain a lot of errors.
Also, keep in mind that many of these dukkis often have incorrect/inaccurate information in it.
The only good thing it can be used for is to get a summary of the caselaws if you don't have the time to read the judgements, because they're basically the relevant paragraphs of the judgements plagiarised into a booklet.
The dukkis are useful at the last moment if you have not studied for the whole semester. There are some useful sites like https://lawplanet.in which only has case summaries on subjects that are covered in my syllabus. It helped me in the last moment.
Depends on the course/prof, if it's a caselaw + bare act - heavy subject with a professor who doesn't want anything more than some copy pasted long answers, it'll work. Theory focused subjects, not a chance. Legitimately good professors who take grading seriously and will read answer sheets in detail, definitely won't work.
Also, keep in mind that many of these dukkis often have incorrect/inaccurate information in it.
The only good thing it can be used for is to get a summary of the caselaws if you don't have the time to read the judgements, because they're basically the relevant paragraphs of the judgements plagiarised into a booklet.