JEE

Hello Sanika, Candidates need to be Indian nationals to be eligible to apply for admission in UG programmes offered at ICT. Apart from this, aspirants should have cleared their qualifying examination (having Science subjects) with atleast 50% aggregate marks if they are from General category. If the applicant belongs to categories like Backward classes and Persons with Disability then they meet the eligibility criteria if they have secured at least 45% marks. However, this percentage reduction would be offered to candidates belonging to Maharashtra State only. ICT Mumbai admission process for BChem and B.Tech courses is such that 70% seats are available for the state of Maharashtra and the remaining 30% are available for All India (all States and Union Territories including Maharashtra). Here, 70% seats are filled on the basis of MHCET merit and the remaining 30% seats are filled on the basis of JEE Main score. Cutoff marks vary slightly each year. According to the data of MH-CET-2017 After round 6 (Round held at institute level) :-
Chemical engineering: 173 marks
Pharmaceutical sciences and Technology: 150 marks
Surface Coating Technology : 145 marks
Food Engineering and Technology: 158 marks
Polymer Engineering and Technology: 163 marks
Fibers and Textiles Processing Technology: 132 marks
Oils Oleochemicals and surfactants Technology: 148 marks. You can now predict 2018 cutoff on the basis of these marks. I hope it helps a lot to you. Thanks :). .

Yes, you need to. AI is a stream of Engineering in which either Integrated course of AI or B.Tech in Robotics is available in India. But most of the colleges which provides AI designing contains Integrated course facility. Admission is these colleges is through counselling based on the marks / rank obtained in JEE Mains or any college based entrance exam. These colleges include :
1. LPU, Jalandhar
2. Amity University, Gurgaon
3. IIIT Bangalore
4. IIIT Hyderabad
or some other state colleges
You can check the list of colleges providing AI Designing course in India :-
https://www.shiksha.com/it-software/ai-robotics/colleges/colleges-india
I hope this helps a lot to you. Thanks :). .

It depends on your branch preference and also which IITs you consider as "good". Cutoffs are much higher in old IITs of Delhi, Kanpur and Bombay than the newly opened ones. JEE Board offered ranks to students scoring above 123 marks in JEE '14 which went approximately to AIR 19000.
However, general category students only up to AIR 9000 were considered for counselling and no student with AIR above 7500 got any branch in any IIT. The cutoffs in JEE are increasing drastically every year - and there is no fixed cutoff. The maximum marks and type of paper is also unpredictable. To be on the safe side, you should aim to get at least 48% of maximum marks - which would give you a rank around 4500. However, to get a decent branch at a “good" IIT a rank atleast below 3500 is must.