A defensible examination answer can be structured as follows:
Syntax: “iyyāka” is a fronted object; the two verbs each contain an implied subject; “wa” coordinates the clauses.
Maʿānī: fronting expresses restriction, and the second clause repeats the explicit restriction.
Effect: worship and appeal for help are directed without ambiguity.
No obvious pun or antithesis needs to be claimed. A complete analysis may rightly say that a given branch of rhetoric has no separately demonstrable device in this passage.