Specific: Targets change all the time. You have to adapt them to your
current situation. Rather, for instance, in the course of programming,
how I want to make a game be like will differ wildly from my initial
ideas. A bigger problem may be it implies measurability in the first
place. See below.
Measurable: I think this leans into school grades! After all, it's hard
to measure the greatness, for instance, of a programming project.
Achievable: Technically, one can do lots of stuff. Practically, some
things are up to luck. As such, achievability is a problem. A bigger
concern may be the opportunity costs of it!
Relevant: Yes, but school told me to set them, which is not relevant if
not for the artificial need of passing exams
Time-bound: Why the time pressure? Parkinson's law? But I
thought the purpose of you wanting a target is to stop procrastination
in the first place. Honestly, if you set a target for yourself, you
shouldn't stress
yourself out with it!
If the stress of having to meet the target, and the psychological consequences of not reaching a target, are worse than the joy of achieving a target, or the direction it gives, it is bad! Perhaps it's better to make them very "micro". Or go into habits instead of targets, as they can be sustained even after you reach them. Targets may make more sense for, you guessed it, school. After you get your A level A*, you can walk home happy you don't have to do that boring studying again. That is the paradox of targets!