If the quants section turns out to be difficult, will it have some easy and medium level qns to cross atleast 85 percentile if selected smartly?

Generally, quants section in CAT comes with a mixture of easy, moderate, and difficult questions. We just need to find the easy and moderate questions and solve them first. Just use the round strategy and you will be sorted.

yes, for sure. At the end scaling will balance out everything, if it turns out to be on the harder side.