Colleges in Lucknow

No, you can't get admission in IET through lateral entry.

No, on the basis of your general rank, you can't get IET.

Kindly specify the entrance exam name.

No, with this rank for lateral entry, you'll not get any government college, but probably you can good private colleges like:
Galgotias University
BBD
SRGI
Ajay Kumar Garg Engineering College

No, with this marks, you can't get Government College for MBA, but you can get good private college in Lucknow, like SRMU, SRGI, Jaipuria College, Bansal College, and SSGI.

Yes, on the basis of your rank, you can get IET, Lucknow for:
COMPUTER SC. & ENGG. (SHIFT-I)
ELECTRONICS & COMMUNICATION ENGG. (SHIFT-I)
INFORMATION TECHNOLOGY (SHIFT-I)
ELECTRICAL ENGG. (SHIFT-I)
ELECTRONICS & INSTRUMENTATION ENGG. (SHIFT-I)
MECHANICAL ENGG. (SHIFT-I)
CHEMICAL ENGG. (SHIFT-I)
CIVIL ENGG. (SHIFT-I).

If there is a seat in the self-financed course then you can take admission.

Revise the syllabus of class 11th & 12th. It will help you a lot.

Both are good. University of Allahabad is a central government university, whereas, University of Lucknow is a state government college.

Your need to score more. and your rank should be around 100 for BSC bio entrance in Lucknow University