Its a bit late that you have asked this question, however I will try to help ya!
QT is the last 6 chapters like LPP, Assignment, Transportation, Learning Curve, Network Analysis and Simulation.
By rigorously going through this, for the next three days you can get a hold, conceptually and with speed.
For theory, there would be shared files in CCI. Try going through that.
ABC, Marginal Costing and Standard Costing are pretty simple. 5 Days if you put in effort you can pass. All the best :)
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hahaha... what is QT... LOL...!
if you attend classes in maharashtra and south india it is popularly known as QT in costing or OR in costing. Operational research / Quantitative techniques....