What are my chances to get into IET, Lucknow with 3408 general and 68 SC rank for CSE?

Please specify the entrance test in which you secured this rank, so that I may be able to populate relevant details regarding your eligibility to secure admission in this course and college. If you are talking about the UPSEE use the predictor tool mentioned at the link provided below to check for y

You might get the college but getting CS in the first round of counselling could be difficult but you will definitely get the CSE branch with ease.