Here are the links of channels/groups of CSE 2021 toppers, as shared by Interview Transcripts telegram group (https://t.me/PTT2019) :

Kaptaan's Channel (IPS, CSE 2021)
https://t.me/TeamKJS
[Physics optional]

Narayan Amit (AIR 70)
https://t.me/Narayan_Amit_AIR70
[One of the Highest in Anthro]

Kushal Jain(AIR 40)
[https://t.me/+Oqhu_JYYj_5iODk1]

Mridul Shivhare(AIR 247)
https://t.me/+8I2EAhWm-Y0xY2Zl

Lakshay Anand (AIR 101, History)
https://t.me/lakshayanand

Vishal (AIR39, 130 in GS2)
https://t.me/tattvamasiiii

Raj Krishna, AIR 158
https://t.me/rjk158

Antriksh Jain - AIR130
https://t.me/antrikshjain309

Ruthvik (AIR 461, anthropology)
www.ruthvikbairy.com

Arjit (AIR 204, Geography Optional)
https://t.me/arjit204

Rahul Bansal (AIR 251)
https://t.me/RahulBansalAir251
For those who are preparing with job.

AIR21, Dilip (Maths optional, 300+)
https://t.me/dilipkk21

Pragya Jat (AIR 91)
Telegram: https://t.me/pragya_jat91

Arpit Gupta (AIR 54, Mathematics)
https://t.me/arpit_gupta_54

Roja , AIR 108, Anthropology
https://t.me/+dqHipTiZ-kY1MWU1

Aishwarya, AIR-4, Geography
https://t.me/aish_verma08

Akshay Mahadik(AIR 212, Anthro)
https://t.me/akshaymahadikcse

Saksham AIR 27 (PSIR)
https://t.me/SakshamGoelOfficial

Naman Goyal (AIR 30, Geography)
https://t.me/namangoyal30

Will keep on updating it as other toppers make their channel/groups