Greetings Nikhil!

Hope you're doing great.

I assume you're talking about in general the trend for weightage for PI and WAT in the management entrance examination for colleges. The trend is different from different college for examination FMS consider 25% of total GD and PI score to include the score into a final composite score, on the other hand, many IIMs gives more than 45% weightage for final scores. No doubt, WAT and PI play a significant role in converting a college of your dream. So, it should be given equal importance while studying for any b-school admission process.

I believe one must start preparing for the GDPI and WAT process while preparing for the CAT exam itself. I say this because, the process of preparation for GDPI and WAT is a rather long and exhaustive process since you are unaware of the topic you might be asked to talk about in your GDPI and/or to write about in your WAT, unlike a limited no. of topics which are to be prepared for taking CAT.