According to the Constitution of India, it is the duty of the President to present which of the following on the desk of the parliament -
1. Recommendations of Union Finance Commission.
2. Report of the Public Accounts Committee.
3. Report of the Comptroller and Auditor-General.
4. Report of the National Scheduled Caste Commission.

Which of the statements given above is/are correct?

Let's examine the constitutional obligations of the President regarding legislative tabling:
* Statement 1 is correct: Article 281 mandates the President to lay the recommendations of the Finance Commission before each House of Parliament.
* Statement 2 is incorrect: The Public Accounts Committee (PAC) is a parliamentary committee. Its report is presented directly to the Parliament by the Chairman of the Committee, not by the President.
* Statement 3 is correct: Article 151 mandates that the reports of the Comptroller and Auditor-General (CAG) relating to the accounts of the Union shall be submitted to the President, who shall cause them to be laid before each House of Parliament.
* Statement 4 is correct: Article 338 mandates the National Commission for the Scheduled Castes to submit reports to the President, who causes them to be laid before Parliament.

Thus, statements 1, 3, and 4 are correct.