NIT

You can take admission in NITs or any government college only if your PCM percentage is above 45%. But you are in reserved category so you can get admission anywhere.

The counselling for NITs, IIITs, GFTIs and IITs will be held after the results of JEE Advanced. You need to look for counselling at www.josaa.nic.in.

No, you will not get any of the NITs with 43 marks. Cutoffs for NITs are too high to admission on the basis of JEE Mains.

Yes, there are some chances for you to get some NITs like Goa, Hamirpur, etc. according to previous year official closing and opening ranks.
As you have qualified JEE Mains and your category rank is also decent, you can get some NITs.
You may refer the link below to know your chances of getting a college:
http://josaa.nic.in/Result2016/result/OpeningClosingRank.aspx
This link gives the previous year ranks for each NIT , IIIT, etc. These ranks vary each year so that this may give you an idea.

Yes, your chances are good. You may get admission in NIT, Warangal for CSE.

You can check the opening and closing rank for general category by doing some Google Search. I think you have less chances but don't lose your hope and hope for the best.

94000 is still very less because previous two years admissions for NITs and IIT according to JEE Mains rank never crossed above 12000 (2016-cut off 12000 and 2015-cut off 11000), better to go for NIT.

Hi,
The minimum eligibility marks in 12th standard must be at least 75% to get any NIT, IIIT or IIT that come under JoSAA counselling as you have only 68% so you are not eligible for that. But if you have a good score in JEE Mains then try for the colleges that accept JEE main scores for admission.

Hello Karthik,
As per your marks, there are really low chances to get a good NIT. I think your rank will be around 1.5 lakhs-2.5 lakhs.
So even if you get admission in NIT it will not be a top one. You may get NIT-Agartala, Meghalaya, Sikkim, etc., they are not equal to top NITs like Trichy, Warangal, etc.
As the official cut-off ranks have not been released you may refer to the link below that gives you the closing and opening ranks for 2016 to check your possibility:
http://josaa.nic.in/Result2016/result/OpeningClosingRank.aspx
You have cleared JEE Mains so there are some chances for you to get admission in NIT.

Which board? If CBSE then your marks are low for IIT, NIT and IIIT. A minimum of 75% required for these for a CBSE board student.