Diploma

Hello Purushottam,
Yes, you can take admission in any B.Tech Engineering course after your Diploma. Other is no such type of compulsion to take admission in the same stream.

I have checked their website. The overall fees for three years of Diploma is INR 1.46 lakhs. Following is the link from which you can check by yourself.
https://www.shiksha.com/college/dr-d-y-patil-polytechnic-talegaon-dabhade-pune-47616?q=Dr.D.Y.Patil+Polytechnic&rf=searchwidget&landing=ilp

Yes, you can just check whether they provide lateral entry or not, and is there any kind of entrance exam for it. Most of the colleges in India provide lateral entry.

Admission to the 3rd Semester or 2nd year of B-tech is possible after completing Diploma. This is called lateral entry. Many private colleges take their own entrance exam for that. You can contact directly to the particular college where you want to take admission.
It depends on the college whether that college is accepting direct admission or not.
In most of the cases, no entrance exam is required if you have secured 60% in the final year of Diploma.

Yes, you can get admission in Jabalpur Engineering College for B.Tech through lateral entry.
Approx. you need to have 60% or above in your Diploma then you can get it easily.
I would suggest you to before taking admission for B.Tech in any college please you learn integration, differentiation and ITS applications in 12th class mathematics because most of the time lateral entry student suffer due to class 12th maths.

For BE (lateral entry), the fee structure is Rs. 23500/- year.

Please refer to the link provided below to download college brochure from where you can check for details regarding admissions, eligibility, fee structure etc. You could also visit college website for further details (Website: http://www.akshareducation.co.in).
Regards.