Academy of Higher Education

You can do it.
But, you have to check the eligibility criteria that college accept this much gap or not for your help, I am attaching a link for the admission process :
https://www.shiksha.com/college/academy-of-higher-education-borivali-east-mumbai-47405/admission
Kindly visit the college.

Yes, you can do engineering. You are eligible for this course.
Good luck.

Yes, you can get admission in direct second year. You can apply for admission.
Good luck.

Hi,
M.Sc in environment science fee structure 87,100 you have to pay, and eligibility criteria is 50%.

Hi,
No, it is not approved by AICTE.
Academy of Higher Studies (AHE) has been established and managed by a team of professionally skilled Intellectuals from different fields. Academy of Higher Studies (AHE) is the National Coordinator (NC) of many UGC/MHRD/AICTE/DEB/BCI/PCI/NCTE etc. approved Universities.
I do not think this is the right place to study B.Tech. The Degree may not fetch you good job.

Yes, you can get a seat in Diploma through lateral entry scheme. As you have said that you have done electrician trade so you can get a Diploma in electrical, ENTC, mechanical, CSE and IT. You have to appear for the lateral entry test conducted by various colleges for the admission. According to the merit, you will get the admission.
Good luck.

It depends on the colleges you choose.

It totally depends on the colleges, that what kind of pattern they follow. Some of the colleges follow the semester system and some yearly. But most of the colleges conduct 2 semester in a year. So, before taking admission in any of the college ask about the semester system. I hope it's clear to you.
All the best for your career!