What are the Best books to learn quantitative attitude for BBA, BBM, BBS. Include theory and MCQs ?

Assuming asking for DUJAT, DU JAT Exam consists of 4 sections, so you need to prepare each section is given proper time.

For English understand the inception of the words-roots,suffix,prefix,etc. among other things. If you can, start reading Editorials of newspapers such as The Hindu. It will also good for General Awareness.

For Quantitative Ability and Reasoning sections You need to be good at your math and/or reasoning skills and be quick as well because the aptitude test is time based. You can prefer RS Agarawal books for this section.

In case if you are asking anything else please let me know.

Good Luck!