You are now pursuing articleship. As far as I understand, it is a full-time job. So, it may not be possible to simultaneously pursue M.Com on a full-time basis. Furthermore, the articleship and study for CA are very taxing and require patience and hard work. It is very doubtful whether you can spare time for M.Com at this stage.
However, if you are determined to pursue M.Com, you can take admission in IGNOU or any other UGC-approved university, to study M.Com in correspondence The M.Com. degree from IGNOU or any other Directorate of Distance Education of UGC-approved university has the same value as that of regular M.Com. degree. Otherwise, you can take admission in regular M.Com course after completion of C.A examination in 2019.
Beware! I question everything and everybody.