Colleges in Mumbai

1] A Bachelors degree or a Masters degree with at least 60% marks (55% in case of candidates belonging to SC/ST/PWD category) or a minimum CPI of 6.5 (6 in case of candidates belonging to SC/ST/PWD category) out of 10 from the universities incorporated by an act of the central or state legislature in India or other educational institutions established by an act of Parliament or declared to be deemed as a University under Section 3 of the UGC Act, 1956, or possess an equivalent qualification recognized by the Ministry of HRD, Government of India. The bachelors degree or equivalent qualification obtained by the candidate must entail a minimum of four years of education after completing higher secondary schooling (10+2) or equivalent.
2] Applicants appearing for final year of the degree and those who have completed the degree requirements and awaiting results can also apply. The applicant should have secured an aggregate of 60% marks (55% in case of candidates belonging to SC/ST/PWD category) or equivalent till the latest exam that has been completed and whose scores are available.
3] CA/ICWA, with a first-class Bachelors degree in any discipline having secured 60% marks (55% in case of candidates belonging to SC/ST/PWD category) in aggregate (including all years/semesters) or a minimum CPI of 6.5 (6 in case of candidates belonging to SC/ST/PWD category) out of 10.

As per the Govt. of Maharashtra Higher & Technical Education Department Information Brochure year 2019-20 (Annexure-III) for admission to full time Technical Diploma courses. The ITI with Electronics Mech. is not eligible for Diploma in Chemical Engineering program. You are eligible for following Diploma courses as under.
1. Electronic 2. Electronic and Telecommunication Engg. 3. Electronic Engineering 4. Industrial Electronics
5. Electronics & Communication Engineering 6. Digital Electronics 7. Instrumentation
8. Instrumentation & Control
Further the admission process of asked college is governed by the DTE Maharashtra through CAP rounds counselling. Hence apply through DTE Maharashtra official website as under.
https://dsd19.dtemaharashtra.org/dsd19/index.php?show=home
Use this link for reading information brochure: https://dsd19.dtemaharashtra.org/dsd19/admin/uploads/Diploma_2019-20_Information Brochure (1).pdf

To be eligible for admissions to BTech programmes at SPCE Mumbai, aspirants should adhere to the eligibility criteria mentioned below.
Aspirants must have passed Class 12th with Physics, Mathematics, Chemistry/ Biotechnology/ Biology as mandatory subjects.
Aspirants must have secured minimum 50% marks in mandatory subjects (45% marks for candidates belongs to backward class categories and persons with disability of Maharashtra state).
Candidates also need to comply with the eligibility criteria stated by DTE.
A. Maharashtra State Candidature
Type
Eligibility Criterion
Home University
Type A
For First Year:
(i) Candidates passing SSC and also HSC or Diploma in Engineering or Bachelor of Science Examination from a recognized institution in Maharashtra State;
(ii) The he/shewho is either Domicile of Maharashtra and/or is born in Maharashtra
Place of passing of Qualifying Examination falling within the jurisdiction of the respective University area.
Type B
A Candidate who does not fall in Type-A above, but who or whose Father or Mother is domiciled in the State of Maharashtra and possess Domicile Certificate.
Place of Domicile Certificate issuing authority falling within the jurisdiction of the respective University area.
Type C
A Candidate who does not fall in either TypeA or Type-B but whose Father or Mother is an employee of the Government of India or Government of India Undertaking and who has been posted and reported to duty in Maharashtra State before the last date for submission of Application Form for CAP.
Place of posting of Father or Mother of Candidate falling within the jurisdiction of the respective University area.
Type D
A Candidate who does not fall in any of the above Type-A, Type B and Type-C but whose Father or Mother is an employee or retired employee of the Government of Maharashtra or Government of Maharashtra Undertaking.
Place of posting of Father or Mother of Candidate or the place of settlement of the Father or Mother if retired or the place of the last posting if deputed outside Maharashtra falling within the jurisdiction of the respective University area.
Type E
(a) For First Year-Candidates passing SSC and/or HSC Examination from a recognized institution located in a disputed Maharashtra Karnataka Border Area or from Maharashtra, residing in the disputed Maharashtra Karnataka Border Area and whose Mother's tongue.