written verbal delays

i have a 13 almost 14yr old son whom im waiting on a dx for im curious if delays in written communication is a possible red flag he is 4 grade levels behind.he also scripts every tv show and movie he sees constintly to the point of annoying,he also has very little eye to eye contact,odd posture,cognitive delays and very immature.there is more but this is just the 1st chapter i could go on and on.another thing he has a problem with is he talks very loudly and i have to tell him to talk lower all the time even in stores.