See there is so many books and notes is available for AMIE section A examination in the market. Jain Publication books are considered as a Text book (as per syllabus) of Section A subjects. And are popular amoungst booksellers & students. Also easily available. relatively cheap and very simple to study well.
Jain Publications Paper solutions for each subject of Section is also available at book stores which is too useful.
Other book publications Like "Shiva publications, 1171, Sector 21-B, Chandigarh 160022". This books were relatively costly. can be opted by postage from Chandigarh which adds in cost. Not sure about relaibility. Not popular.
Other Source is IEI Study materials which were relible as it is with the prescribed syllabus of IEI. But relative to above two much costly arround Rs. 500/- per each subject and takes long time to get in our hands from IEI by register post.
Its upon you to use which study material. But in my suggesion kindly use any one type of study material for single subject. do not try to use more than one study material for single subject it may leads to Jumbling or confusions./
With Best Regards,