Bundelkhand Institute of Engineering and Technology

Yes, you can admission in Bundelkhand University with this rank.

I think you should choose government UPTU colleges if you have a good rank and UPTU colleges should be IET, HBTI, CSJMU and Bundelkhand University. These colleges have very good placement records and these are top engineering colleges.

Yes, you can get IET and KNIT both, but not BIET.

If it's about placement then you can go for CSE, you can choose any of the colleges mentioned above. Anywhere CS/IT students get easy placements.
If it's about location. Lucknow is much better than Sultanpur in all aspects.
IET-Lucknow has a better campus than KNIT. Well, finally it all depends on your interest. As you already passed out 12th and if you're from CBSE board, you have already studied computer in last two years (I know it's option, but then also )
If you want to go for government jobs, just go for civil engineering, if you want to work in private sector, go for CSE.

UPSEE 2018 College Predictor
Use your UPSEE 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack.
The result is based on admissions data of UPSEE 2017.
Get resources, insights on colleges & courses:
https://www.shiksha.com/b-tech/resources/upsee-college-predictor

UPSEE 2018 College Predictor
Use your UPSEE 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of UPSEE 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/upsee-college-predictor

KNIT provides a large number of placements for CSE department as compared to BIET, Jhansi. Companies like TCS and GL are the mass recruiters.