Yes, This is a complex sentence and structurally the third clause “he feels” needs a change of tense form and conjunction.
You can say: The student decided that he wouldn't watch TV for the next one month irrespective of the lure and enticement which he might feel.
But you can express the same thought in a more natural way by reducing the dependant clauses to one; as:
The student decided to refrain from watching TV for the next one month irrespective of the lure and enticement that he might feel.
Student or Learner