The syllabus includes of related topics way before in 6th or 7th grade. Some of them are often repeated (may be even intentionally). They learn about elements and their composition in 7th or 8th grade. After having all that, if student is inclined to it they learn more in 11th and 12th grades. Most of students follow up to 12th in India. If you are so concerned go check the textbooks yourself - https://ncert.nic.in/textbook.php
Although I donât suppose most people wonât do that because why put the effort to understand things when you can spew dumb opinions around ?
The reason the topics were rationalised to improve remote learning and reduce burden on students during exams in a country where suicide rates among students due to exams and societal pressures is a real concern.
The way people have been reacting to this is as if students coming out of school are dumb fucks with no scientific knowledge. I bet the ones commenting here doesnât even know half of what those students know.