It is possible to pursue Ph.D. along with M.Phil. But it will not give good results. As you must have heard, you can’t sit at two boats at the same time. Hence, it will affect both the degrees. The candidates who sometimes are not able to successfully complete Ph.D. are awarded with M.Phil degree. Ph.D requires 5-6 years for completion while M.Phil requires 2-3 years. A Ph.D. has more value than M.Phil.