Section 202 makes the new regime the default for individuals unless the prescribed option is exercised. Its subsection (2)(a)(xii) computes income without Chapter VIII deductions other than specifically listed exceptions; Section 129 is not listed. Therefore, an otherwise eligible education-loan interest amount does not produce this deduction while tax is computed under Section 202(1).
That does not mean opting out is automatically better. Compare total tax under both permitted treatments using the current return utility, including every other income item, deduction and surcharge/cess consequence. Business/professional-income taxpayers have different option mechanics from taxpayers without such income, so do not copy another person’s filing choice.