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The quark exchange model (QEM) is reformulated for the $A=12$ and $14$systems to obtain the constituent quark distributions of $^{12}C$ and $^{14}N$nuclei, respectively. Afterwards, the different types of the point-like partondistribution functions (PDFs), i.e., the valence quarks, the sea quarks and thegluons, are extracted from the constituent quark model (CQM), at the hadronicscale $Q_0^2=0.34$ $GeV^2$ to generate the constituent quark exchange model(CQEM = QEM $\oplus$ CQM) PDFs. From the resulted PDFs, the structure functionsand the European Muon Collaboration (EMC) ratios of the above-mentioned nucleiat the appropriate hadronic scale are calculated. To make our results morecomparable with the available experimental data, we evolve the PDFs, by usingthe standard DGALP evolution equations, to the higher hard scales.Subsequently, the EMC ratios of $^{12}C$ and $^{14}N$ nuclei at the some higherenergy scales, corresponding to the scales of available data, are calculated,at the leading (LO) and the next-to-leading (NLO) orders of pQCD. By doing so,it is observed that the EMC ratios do not significantly depend on the hardscale $Q^2$, and the outcomes are consistent with the various experimental datasuch as HERMES, BCDMS, JLab, SLAC, NMC, and EMC. Especially, in the mid-rangeof Bjorken $x$ values, the results are so desirable. Like our previous worksfor the $^4He$ and $^6Li$ nuclei, we again observe that at a fixed scale $Q^2$,the LO and the NLO EMC ratios with high precision are approximately the same.Therefore, one can conclude that at a given hard scale, the LO approximation isgood enough for calculating the EMC ratios of light nuclei.

Application of the constituent quark exchange model to the parton distributions and the EMC ratios of $^{12}C$ and $^{14}N$ nuclei