Strictly necessary, no. Strongly advisable in today's India, yes, for reasons that are partly developmental and partly bluntly practical.
The developmental case
Between ages 3 and 6, children build the foundations that formal school assumes: sharing space with 20 other children, following a routine, holding a crayon, sitting through a story, managing the toilet away from home, and being understood by adults who are not family. A good preschool rehearses all of this daily. NEP 2020 formally recognised this by folding ages 3 to 8 into a single "foundational stage" and pushing universal pre-primary access, and the policy direction of the whole country is that structured early learning matters.
Can a rich home environment substitute? Partially. A child with an engaged caregiver, siblings or park friends, books, and real conversation can arrive at Class 1 socially and cognitively ready without preschool. The children who struggle without it are usually those whose alternative was isolation and screens, not those whose alternative was an attentive grandmother.
The practical case (the one nobody says aloud)
- Class 1 admission assumes it. Most private schools expect applicants to have done LKG and UKG, and their Class 1 curriculum starts where UKG ends: letters known, numbers to 50, pencil grip in place. A child who skips straight to Class 1 in a private school starts behind on day one.
- Many K-12 schools recruit from their own or partner preschools, so the preschool is quietly also an admissions pipeline.
- Government schools and RTE-based entry are more forgiving, and Anganwadis cover pre-primary in much of the country at no cost.
A reasonable middle position
- Playgroup (age 1.5 to 2.5) is genuinely optional. Skip it guiltlessly if home care is good.
- The two KG years (roughly 4 to 6) are the ones that matter. If you do only part of the ladder, do LKG and UKG.
- Nursery (age 3) is valuable but flexible, a strong half-day nursery year is the sweet spot for most children.
If you skip preschool anyway
Be deliberate at home: daily read-alouds, scissors and crayons, playground time with the same set of children, small errands and self-care tasks (shoes, spoon, taps), and practise short separations. And check the Class 1 admission expectations of your target schools two years early, so the practical door stays open while you make the developmental choice that suits your family.