Much of this is in error!Yes, you are right, IQ has something to do with N or S. N people tend to be smarter as they are able to grasps theories easily.
This is the J part. Nothing to do with N or S. You seem to be action oriented and like to express your logical thoughts to practical ends (Hence the Te)
Nothing much to deduce from there...
Now back to the explanation, your issue is confused between Ni and Si. Let me explain here,
Ni is the gathering ABSTRACT information from the inner world. This would most likely be a day dreaming or visioning process. If you tend to slip into imagination often... you are most likely INTJ. If you are very optimistic with new things and tend to be pessimistic with tradition, you are most likely INTJ
Si is gathering REAL information from the innerworld. This would most likely be reflecting past experience process. Si values tradition (i.e. past experience) more, They need proof before attempting something... Due to this, they tend not to take ambiguous risks
Can you give some more situations?
I also have a few questions to strike out the ambiguity
1) Are you left handed? If you are left handed you are definitely N type
2) Do you enjoy reading the theories and concepts of MBTI? Do you try to find the abstract definition of it
3) Do you value tradition. Do you enjoy doing things repetitively? Can you stand doing the same thing over and over again?
Anyway, hope this helps!:laughing: