IIT

Marks needed to qualify is called cutoff marks. Every year it changes. It is not fixed. This year, the cutoff for ST category is 29. So, for getting eligible for JEE advanced student need to score minimum of 29 number. And, getting the admission through JEE main only then student need to score minimum of 90 above. Also, for getting admission in IIT you need to qualify the JEE Advanced. JEE Advanced have different cutoff marks. So you need to qualify with high marks in JEE Advanced for getting admission in IIT.

You want the easiest book that too for IIT preparation. HC Verma is the best book. Nothing can replace that. Don't try for the easiest one. You can then go for DC Pandey. But, if you want to crack IIT practice as complex as you can.

In case you have missed the cutoff required for JEE Advanced as JoSSA counselling is there for the rescue. JoSSA 2018, centralized counselling for JEE Main and Advanced to get admissions to top engineering colleges. The registrations process for JoSAA 2018 will be open tentatively from the second week of June 2018. So, all the qualified candidates need to keep a tab on that.

2018 MHRD ranking of engineering colleges in India are mentioned below. This list includes the top 100 engineering institutes in India and includes both IIT's and NITs, and is for reference purposes only.
https://www.shiksha.com/b-tech/articles/2018-mhrd-ranking-of-engineering-colleges-in-india-blogId-15711

In NEET, the physics questions are among the ones that every one solves while in 12th standard. JEE physics is of a bit higher level because the paper is set for upcoming engineers who need to know extra. NEET paper contains difficult questions of physics and calculus trigonometry also, but the level of difficulty is not like that of JEE.

You can go for private colleges. They will give some scholarship on the basis of your percentage of 12 and the marks you scored in the entrance exam conducted by college itself. If you have got 85+% in 12, you can get direct admission in UPES, ICFAI, LPU or GALGOTIA (Maybe), definitely. Also, if you are unable to score that much percentage in 12, then score in the entrance exam. Then only you will get the scholarship.
Best of luck.
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Hello Bhavesh,
The admission into IITs for undergraduate engineering courses is strictly based on the ranks In JEE Advanced exam. But, you need to qualify JEE Mains to appear for JEE Advanced. There is no other way to get admission at IITs.

Minimum marks you must score to get a chance for a seat in IITs you need to score around 150+. Competition is fierce for top IITs. A score around 45 was cut off for JEE Advanced. This year 34425 qualified in JEE Advanced. Minimum marks -73 and Maximum marks-29. Comparison-
JEE Main 2018 cut offs for JEE Advanced has dipped significantly this year as compared to 2017. For 2018, the cut for general candidates is 74 as compared to 81 in last year.