How to Read PT365 for UPSC Prelims: Minimum Time, Max Marks

Reading PT365 for UPSC Prelims is where most aspirants quietly lose weeks of time. In this walkthrough, Neil Sir reads the PT365 Science and Technology magazine the way a smart aspirant should — treating it as a filter rather than a copying exercise. The single idea behind the whole video: stop making notes of everything, highlight only what is genuinely exam-relevant, and finish a five-page section in minutes instead of hours.

Key takeaways

• Do not make notes of anything that is common sense, already in a standard book, or so obscure it has never appeared in a previous year question.
• The fourth and most important principle: don't make fresh notes at all — just highlight the basics, then screenshot those highlights into one small document.
• Coaching magazines are often paid per page, so they are padded with detail that has nothing to do with the exam; your time and memory are limited, so optimise ruthlessly.
• Note only keywords that connect to previous year questions — scientific names, named techniques, and named institutions.
• "Overarching understanding more than detailed analysis" is the mantra: know what a thing broadly is, not its microbiology-level internals.
• In the exam, most big application-style statements are correct on overarching understanding; watch for extreme words like "only" and "entire".

The core filter: when to take notes and when to skip

Neil Sir lays out a simple set of rules for deciding what survives the read:

• If a fact is common-sensical, skip it. "Genome editing is altering the DNA of an organism" — you already know this, so noting it adds nothing.
• If it is already in a standard book or basic source, skip it.
• If it is very obscure and has no link to any previous year question, skip it.
• For everything that remains, don't write a fresh note — highlight it in the magazine, and at the end of a topic build a tiny document from screenshots of those highlights.

He is candid about why magazines feel so bloated: many are produced on a per-page basis, so whoever writes and outsources them is incentivised to fill pages and raise their per-page commission. That padding is not your concern — your job is to extract the handful of exam-relevant points and move on.

Genome editing: a worked example of the filter

The first topic, genome editing, shows the method in action.

• The story is that Indian researchers developed the first low-pungent mustard using genome editing. The name itself tells you what it is, so at most note: first low-pungent mustard developed in India.
• It was produced by gene-editing Varuna, a high-yielding Indian mustard variety — overarching understanding, nothing more.
• Brassica juncea, the scientific name of Indian mustard, is worth noting. UPSC has asked official scientific names based on previous questions, so the correct name and pronunciation earn a highlight.
• Site-Directed Nuclease (SDN) becomes an important keyword — SDN-1, SDN-2 — because it is tied to genome editing.
• CRISPR has appeared in previous year questions, so knowing its full form is fair game. Other techniques — zinc finger nuclease, transcription activator-like factor (TALEN), ZFN — only need overarching understanding: if a future question asks what they relate to, the answer is genome editing.

The same filter exposes which "facts" are actually high-value:

• GM crops require environmental clearance from GEAC, which is established under the Environment (Protection) Act — and EPA is important in previous year questions, so that linkage is worth noting.
• Bt cotton is the only GM crop approved for commercial cultivation in India. The word "only" is usually a red flag in statements, but here it is a genuine exception — so note it. Related terms like Bollgard and pink bollworm resistance need only overarching understanding.
• Details such as exact glucosinolate limits, the precise alien genes in DMH-11, or how a CRISPR protein complex forms internally are page-fillers. This is the job of an administrator, not a national physics or microbiology laboratory, so those internals get skipped.

Gene drive and genome sequencing: same method, less time

The later topics get even faster once the filter is internalised.

Gene drive technology

Gene drive is built on genetic engineering, so that is inherent in the name. Its three key components reduce to a couple of highlights: Cas9 enzymes (molecular scissors, which have come up in a previous year question) and CRISPR (already highlighted earlier, so not repeated). The detailed mechanics of altered versus normal inheritance are unnecessary for this exam.

Genome sequencing

• The difference between long-read and short-read sequencing is largely semantic — short-read breaks DNA into small fragments, as the name suggests.
• Basic facts — a genome is an organism's complete set of DNA; humans have 22 numbered chromosome pairs plus one sex pair, 46 in total — should already be known. Highlight them only if you never studied biology.
• A few specifics are worth a highlight: the X chromosome was the last human chromosome sequenced end to end; the Y chromosome bears the SRY (sex-determining region Y) gene and carries junk DNA; junk DNA is simply DNA that does not contribute to traits. Telomeres cap and protect chromosome ends — just know the link to chromosomes, not the internals.
• For named programmes — the Telomere-to-Telomere consortium, the Genome India Project (DBT), and the IndiGen whole-genome sequencing programme — overarching understanding and logical reasoning are enough to recognise them in an option.

How to attack Science and Tech options in the exam

Neil Sir closes the loop on why this approach scores marks. In the statement-based paper, most large application-style options are correct on overarching understanding alone — roughly 99% of applications you can reason through. The traps are the extreme statements: a claim that the Human Genome Project covered the "entire" genome, for example, is incorrect, just as "only" usually signals a wrong option. And when an option is clearly unrelated to genetics, you can ignore it outright, regardless of how much detail it carries. Reading the previous year questions after finishing a PT topic confirms that the filter keeps exactly the points UPSC has historically tested.

Who should watch this

This is for UPSC Prelims aspirants drowning in current affairs magazines who feel they are reading endlessly without retaining anything. It is especially useful for anyone preparing Science and Technology from PT365 and for candidates who want a repeatable, time-saving method rather than passive highlighting of every line.

To turn this method into a habit, pair your magazine reading with regular question practice — the UPSC Prelims test series helps you see which overarching points actually convert into marks, and the blog carries more of Neil Sir's strategy guides. As he recommends, also skim the newspaper-analysis series next so your current affairs preparation, from daily news to PT magazines, fits together as one system.