Hey aspirant

Among Marrow and Prepladder Marrow is the best for a post intern for concept building because, Marrow has covered all the chapters of all subject very carefully. Marrow has all their detailed videos. And Prepladder hasn't covered all of them as good as marrow they have skipped some chapters. So, for concept building Marrow is the best if you follow thoroughly all their videos.

Hope this helps.

All the best.