Thank you for replying @kw0573,
For irregular I mean by taking 3 sciences and 2 languages and mathematics. My coordinator said that in order to do 3 sciences I must have a letter from university that require the 3 sciences to send to IB for the permission. Btw, I m currently doing 7 subjects Math Hl, Psychology Sl ,Chemistry Hl, Biology HL, English B Hl, Thai ST sl, and Physics Sl(Im dropping psychology if i get the non-regular permission). I want to do the irregular diploma because I think that I might find Physics easier than Psychology since psychology does require alot of reading and physics is more likely to be mathematical which I know how to cope with. What do you think about this? At least for this year, i will try 7 subject and I will see if i m doing well in physics or not if not then i probably going to do a normal diploma.