Regarding doing other course in articles period

According to me you will have to seek institutes permission to pursue the additional course even if you are on leave..because your 3 years of articleship is not over yet... kindly visit the institute and ask is there a way out..

Thank you sir for your suggestion

also assuming your management regular course timing would clash with articleship timing the permission would not be granted..so you can request the college or the institute where you are going to pursue the course to give a letter stating that for 6 months or so you can attend your articleship duties and they have no objection to this..