Can be doing the part time job when training period?

I was starting this part time job along 3 years a go. Now I'm have my training period on my Diploma in Pastry. I'm knowing that the following of the month on Jun I take much of the leave for my examination C&G of Advance diploma. But I apply another leave for my part time job which is using of my claim hours and off day. Is it hard to accepted on this apply? Now my total over time was 19 hours, that mean I can use it for change my off day by claim 8 hours OT for one day off. I know that many company they can't accept their staff have another part time job when they working on their company. That why, I also think that I'm hard to taken leave through by this reason.

But, today I just request to my leader I wanted to taken leave again beside my leave for exam. Maybe he is miss understanding on my request. For me just need to arange my off day to saturday and claim hours for two days. But on basic, I just try to get leave on saturday. Even that I can't join the whole part of part time job, but atleast I can join 3 days on it. Some more, I can get another income beside from the allowance from hotel that is RM200 per month. Acctually, that is not enough for me to cover my expenses for one month. Hope that I can get apply off day on saturday smoothly, about the claim hours day...... haiz ..... just depend of luck.

If you are the boss, did you allowed your staff get another part time job beside of the main job?