Kaarakollaasa of Bharata Mallika — The easy book of Karaka in Sanskrit

https://archive.org/details/karakollasa

Usually learning karaka in sanskrit is difficult. This book summarises the entire karaka in less than 100 slokas which are easy to memorise than the complex sutras.

One can get a good command in less than 2 weeks if this is learnt with a teacher.