Here's my little portfolio at age of 22
Hdfc Moneyback:-104k LTF
Icici Apay:-100k LTF
Axis flipkart:-31k LTF
One card:-90k LTF
Sbi:-62k 1499**
kotak leauge:-90k LTF
citi Rewards:-64k 999**
Idfc first:-71k LTF
indus legend:-90k LTF
Pnb platinum:-80k ALMOST LTF
First card received in 2020...
I m also student with 5 credit cards
Hdfc Money Back-80k
Icici amazon pay-90k
Axis Flipkart-16k
ONE card-90k
Sbi Octane-62k
Two PAY LATERs
Around 1L
all you need to do heavy transactions in first 180 days then don't use card too much and wait and watch bank will offer you.