USA - Visa slot whatsapp group

Hi all, I have got admission for spring 2022 but still I am not able to get visa slot .If anyone could suggest me whats

Do Professional LOR’s require any stamp from the company?

Do we need to get the lor sealed / stamped or is it not required and can we submit a pdf?

Can anyone Suggest me a good University for MS in Business Analytics in the US?

GPA - 7.9 (TIER 2 COLLEGE) GRE - 313, AWA -4TOEFL - 95+ ( EXPECTED)

ASU vs NEU

Hi, I have received admits from ASU and NEU for MS in CS. Which one is better? I am inclined towards finding a job after