Predict the number of peaks in H-1 NMR of sesamolin
For sesamolin, I think the pairs of protons at A and N would have the same chemical shift. In the spectrum this would appear as a singlet with an area corresponding to 4 protons due to the accidental equivalence of the A and N site. It looks like you did this in assignment of sesamin, which looks good to me.

Assigning shifts to geminal protons can be tricky. For example, the differing chemical shifts of the axial and equatorial protons in cyclohexane can only be resolved at low temperature:



Some more examples below: 



Both of the images and more information on the topic are available here:
https://www.chem.wisc.edu/areas/reich/nmr/05-hmr-02-delta.htm