Say the ratio out loud before you open Reasoning — recalling it unprompted is exactly what the exam pays for.
Why it matters
This is a short chapter, deliberately. The course names Garikapatti Veeraya for one thing only, and an honest short answer on it is worth more than a long invented one.
What it is named for is this: when the Supreme Court in Maharaja Chintamani Saran Nath Shahdeo v. State of Bihar AIR 1999 SC 3609 held an amendment to the rate of compensation prospective, it described its own approach as applying the golden rule of construction stated in Garikapatti Veeraya. So the case is the stated source of the rule of construction on which the leading prospectivity decision in this module rests. That is its role in the paper, and you should give it that role and no more.
Facts
The course does not set out the facts of Garikapatti Veeraya, the provision in issue, or the dispute it decided. Do not supply them, and do not reconstruct the judgment. Where a paper names a case for a proposition and says nothing further, the correct answer states the proposition, names the case as its source, and stops.
Held
What this course establishes is that Garikapatti Veeraya contains the statement of the golden rule of construction that the Supreme Court applied in Chintamani Saran Nath Shahdeo when holding an amendment to the rate of compensation prospective. The course does not set out the terms of the holding beyond that, and an answer should not attribute any other proposition to the case.
Reasoning
The reasoning available to you is the reasoning of the decision that invokes it, and that is where the marks are.
In Chintamani Saran Nath Shahdeo an amending Act changed the rate of compensation. The Court found nothing in it to show retrospective effect, held that "the essential idea of a legal system is that current law should govern current activities", and concluded that compensation fell to be determined under the provisions in force when it became payable — "unamended sub-section (4) of Section 25 of the Act would apply." Because the amendment affected a substantive right, it operated prospectively. The Court described that approach as applying the golden rule of construction stated in Garikapatti Veeraya.
Two observations are worth making in an answer, and both are supported.
First, on the label. Courts use the phrase golden rule loosely. Jugalkishore v. Raw Cotton Co. AIR 1955 SC 376 refers to "that golden rule of construction" when it means reading the words literally, and so does Lalita Kumari. Do not assume that a judgment invoking the golden rule is applying Grey v. Pearson; look at what the court actually did. In Chintamani Saran Nath Shahdeo what the Court actually did was decline to read retrospective effect into words that did not carry it.
Second, on the substance. The result in that case is the presumption against impairing existing rights: a statute should be interpreted, if possible, so as to respect vested rights, and "No statute will be construed to have retrospective operation unless such a construction appears very clearly in the terms of the Act, or arises by necessary implication" (P. Janardhan v. Union of India). That presumption has its statutory counterpart in s. 6 of the General Clauses Act, 1897, which preserves accrued rights and liabilities across a repeal unless a different intention appears.
Exam use
It opens nothing on its own. Use it as an attribution: when you state the rule of construction applied in Chintamani Saran Nath Shahdeo, name Garikapatti Veeraya (AIR 1957 SC 540) as the judgment in which the Court stated that rule. That earns the citation mark without risking an error.
It disposes of nothing by itself.
It does not decide anything that this course states beyond the point above, and that is the important instruction. Do not give it facts, do not give it a holding on prospectivity of its own, and do not let a phrase like golden rule tempt you into describing it as a case on absurdity. If an examiner asks about Garikapatti Veeraya directly, say what it is cited for, cite it accurately, and put your effort into the decision that applies it.