B.Tech

Your medical certificates, domicile certificate, caste certificate, income certificate, your 10th and 12th mark sheet along with passport size photos.

You can expect NITs since you are from SC category. Also some Tier 1 campuses like ITM and Jaypee. All these campuses have very good placement ranging from 4 LPA to 6 LPA.

Yes, you can get direct admission in private colleges but not in a government college and yes, you will get a updashomattar scholarship but your family income should be less than 1 LPA.

Feroz Gandhi is a government college with good placement record and has a descent faculty and facilities. Last year, placement was around 4 LPA.

Books are dependent on your Diploma branch, but for lateral entry, you have to clear all your doubts and you should have proper knowledge of your subject.

IET is the best college in Lucknow and with this score, there is 70% chance that you will get IET.

Jaypee is better in terms of placement and teaching. Placement package ranges from 3 to 5 LPA in this campus but the package in ITM is very less as compared to Jaypee. So I suggest to go with Jaypee.

We cannot compare both the courses as both are way more different. Both the courses have their own scope and it totally depends upon the student.

Of course, you can get admission for B.Tech. The fact is you will not get reputed college. After looking at your score you will end up with some local private institute. Although your 12th percentage are good but it won't help. As, per criteria colleges first consider your JEE score. There is one more choice to get top colleges that is through management quota. While applying through management quota you have to pay huge amount of fee as donation in terms of getting admission. So, if you are ready for management quota then go for it unless you have to go with your score and look out for some private institute.
Best of luck.

Yes, you can easily get a very good NIT with the electrical branch, because you're rank is very good.
Best of luck.