Whether you will get a seat or not depends on a number of factors like:

1.Board(Gujrat board or other for CEPT)

2.Domicile

3.Category

4.Seat Distribution

5.score in 12th board

You have a good NATA score and 12th score, I'll suggest you to try and see where you stand in the rank list

Yes, anything above 120 is considered as a good score. It depends on your 12th score also whether you will get a good college or not.

Visualise it in your mind first and after you are able to visualise unfolding the paper, draw the unfolded paper and count your squares.

But visualisation is the key point.

The NATA results have been postponed to Monday, 4th June

Yes, you can get SPA Delhi with this rank. In 2016, last rank (general category) to get admission into SPA Delhi was 975.

If you are targeting other colleges with this rank, then visit the below mentioned link to know at what rank students got admission.You can select the colleges, category, institute and course duration according to your preferences.

JoSAA opening and closing ranks for year 2016

Yes, 749 is a good rank to get top colleges of India.

the answer to the question is wrought iron here is the proof- https://sites.google.com/site/engineeringtheeiffeltower/the-eiffel-tower-materials-engineering

More than your marks, its your All India rank that decides whether you will get into IIT Bombay or not, because each year difficulty of paper changes and so does the marks. Since you are from general category, you should target a rank below AIR-15 (All India Rank) to confirm your seat in IIT Bombay.

I would suggest that you have plenty of time for UCEED 2019 preparation so work hard and give your best shot.

ALL THE BEST!!!!!