should I take the past clat question papers since the pattern has changed from 2020?

Dear student,

Even if the clat pattern is changed then also it is important to give or practice the previous years question papers in real time. Because previous years question papers is important to know the level of questions asked and also it is necessary to know the depth of your preparation.

So, don't skip practising the previous years question papers.
As for the latest pattern you can practice the model test papers in real time.