Does qadar change? The short answer is…
Man does not know what his destiny is. Therefore, what is required from man is to be zealous and enthusiastic to perform his duties in the best way possible within the framework of the mind, will and possibilities that Allah has bestowed upon him. In respect to Allah, qadar refers to His knowledge of everything that happened and will happen. In fact, His knowing everything is a requirement of His absolute divinity. When we think about from this perspective, talking about the change in qadar means to talk about the change in the knowledge of Allah; which is not possible. Therefore, any change in qadar is out of question.
However, some Islamic scholars said that qadar may change if Allah wants. To them, qadar is the predestination of Allah and qada is realization of it. Sometimes Allah bestows His kindness upon His servant and does not realize His predestined judgment on him.
The scholars, who state that qadar may be changed, classify qadar into two types absolute qadar (fixed qadar) and suspended qadar (conditional qadar). They noted that the change may happen in the latter, the suspended qadar, not in the former. According to them, the hadiths that mention that charity wards off the troubles and visiting our relatives expands life-span confirm this. Essentially, when it is considered within the context of the eternal knowledge of Allah, we can say that there is no change in the second type of qadar, either, because Allah predestines the qadar by knowing how His servants are going to act when they face the conditional situations.
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS