Hello Aspirant,
There is only 1 way to get admission in b.tech in any IIT and if you want to do m.tech, you can continue it there.
And this is by jee advanced.
And you can also get admission in IIT for m.tech through GATE .
So,.
good luck...!!!

Thanks for the A2A brother.

Well, it looks you might be a JEE aspiant once but can't find a spot in IIT like many aspirants but still for the feel, you want to get inot IIT.

Regarding approaches

1. JEE advanced. This is the most prestigious and most respected way. But it same requires, immense hardwork.

2. To study at KVPY. Many IIT's like IIT B or IIT KGP, inside have KV schools till 5th class. This is the easiest way to get into the IIT

3. By GATE score. If you score above 68 marks in Mechanical GATE, you are likely to get into a  decent IIT for M.Tech

4. Fashion designing course. This is sponsered by IIT G and IIT B.

5. By CAT. Having a percentile of over 80 will land you into a top IIT colleges for MBA.

6. If you are way too rich, do your B.Tech and MS from foreign institute (not necessary to be ivy college) but apply for P.hd at IIT. You are likely to eb selected at the top IIT's for their doctorate program. This is the most expensive way.

Thank You

Hello Anku

Your question is not so clear but I think you want to ask how many ways are there to take admission in IITs and if it so I would inform you that there is only one way by qualifying jee main and jee advanced exam with good rank in advanced exam is the only way to get admission in IITs. 

So to be there you should crack jee. 

Any query you may ask further.