Open-tuition Notes VS KAPLAN Books

Hello there, I have been studying for the MCS (Management Case Study/Gateway) exam using most of the available materials. I would like to know, which materials would be much effective to allow me to sit for the August’19 session (within such limited time), the KAPLAN Books or the Opentution Lecture notes?

I know books are considered to be the best platform for learning purpose, but I somehow found the Opentution lecture notes very much helpful and easier to learn. Would these notes be a strong platform to get prepared for the MCS exam in August’19??

Would appreciate your feedback.