Regular study and job of GDS BPM together

I was employed as gds bpm(3 & half hour) which is governed by GDS(engagement and service rules 2011) under dept of post. i joined in 2015 , 1st resigned after 4 months of service but they not relieved me..i again written them after 10 months of initial joining and finally relieved after 14 months of total service..would it be any problem for me if i mention it in attestion form for my new job as i continued regular study with that job