Which site is better for preparing for aptitude for campus placements, GeeksforGeeks or IndiaBix?

For campus placements, IndiaBix is best.

IndiaBix has mostly easy to moderate level questions which are mostly asked in interviews. If you want to practice difficult questions then IndiaBix is not a good choice.

Geekforgeeks is good for puzzles or brain teasers which are sometimes asked during HR interviews of some companies.

So, for practising only easy or moderate questions, go for IndiaBix.