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Sourav.You are at the right age to start making a strong foundation in achieving your ambition.
1. Get very good marks in 12th std.
2. Start exercising regularly
3. Join a degree course like Law, Psychology, Criminology, Forensic Sciences, IT or Public Administration.
4. Allocate time every week to prepare for UPSC (Union Publics Service Commission) exams when you are pursuing your degree course.
Finally, Though you can be a graduate in any discipline to appear for UPSC exams , the above mentioned degree courses might be useful for a career in Police Dept. Once again I will advice you to concentrate of your 12 std and get good grades. Best of Luck. Give me a thumbs up if I have answered your question.

Eligibility
Passed the HSC (10+2) examination of Maharashtra State Board of Secondary and Higher Secondary Education or its equivalent examination with following subjects: English, Physics, Chemistry and Mathematics and secured minimum 50% marks i.e. not less than 150 marks out of 300 marks (45% marks i.e. not less than 135 marks out of 300 marks for OBC candidates from Maharashtra) in the subjects Physics, Chemistry and Mathematics added together.
Eligibility Criteria
a) Maharashtra State
In addition to educational qualification as specified, candidates are required to appear for MHT-CET 2009 and secure nonzero score to be eligible for admission for State Quota (65%) seats through Central Assessment Process (CAP).
b) outside of Maharashtra State
In addition to educational qualification as specified, candidates from Maharashtra State as well as outside Maharashtra State are required to appear & qualify in All India Engineering Entrance Examination (AIEEE-2009) conducted by C.B.S.E., New Delhi for the Academic Year - 2009-10 to be eligible for admission.
http://www.mitpune.com/mit/download/Admission-Procedure-ENGG[1].pdf

Admission Procedure
Domestic Students
Step 1: Register for the SNAP entrance test at www.snaptest.org and pay Rs 1,550/- in any one of the ways mentioned in the SNAP website.
Step 2: Apply to SSBM: Students would be required to register for the SSBM programme online at www.ssbm.edu.in on or before 28th December, 2011. A registration fee of Rs 1,000/- is payable in any one of the following ways:
Online payment through Debit card or Credit card (through the SNAP website)Transfer through Net-banking facility (Through the SNAP website)Demand Draft
Payment by demand draft:
A demand draft in favour of 'Symbiosis School of Banking Management' for Rs 1,000/- payable at Pune may be made and sent to the address mentioned below:
Office Superintendent
Symbiosis School of Banking Management
Gram Lavale, Taluka Mulshi
Pune 412115
Email: os@ssbm.edu.in
Telephone: +91 20 39116284
Telefax: +91 20 39116022
D. Payment through Real Time Gross Settlement (RTGS): Bank transfer through RTGS to bank account number 050310210000035. RTGS IFSC code: BKID0000503, Bank of India, Karve Road Branch, Pune - 411 004.
Step 3: Appear for the SNAP test.
Step 4: Shortlisted candidates to appear for the group exercise and PI.

M.e or M.TECH is still possible
there r 2 ways of Pursuing M.TECH
1ST THE general way 2 yrs course with 4 semester (which u r late )
2nd way is M.Tech (through Research Mode) (the way PHD is done )
in this mode there r no writen examination
students has to write the thesis & submit he same to the university
after the thesis has been submitted , student may be called for viva voce
& if found satisfactory
the degree of M.tech through research mode is awarded t o the student
here r very few universities in India offering this Mode of M.Tech
as far as MBA is concerned even that is possible through distances mode
Global open university
sikkim Manipal University
vinayaka mission university
lovely professional university & many other r available
www.swaraneducouncil.org
E-MBA (executive Mba 1yr is also available which depends upon the experiences u have )

Hi Yaksh,
Well firstly if you are planning to take up a M.Tech / M.E in software engineering without having a relevant education background seems least of a possibility. But as correctly mentioned by @Subahasish debroy982 , you can opt for other related courses.
DOEACC is one of the best source to achieve this goal of yours, however if you belonged to commerce stream and happen to study Maths at +2 level, you may look forward to pursue MCA from a good institute in any where in the nation.
There are several of good institutes offering MCA and to know about these, you may kindly refer to the below links:
https://www.shiksha.com/search/index?keyword=MCA+colleges&location=&searchType=course&cat_id=-1&countOffsetSearch=25&startOffSetSearch=0&subLocation=-1&cityId=-1&cType=-1&courseLevel=-1&subType=0&showCluster=-1&channelId=home_page
But still to be able to provide more information, it is advised that you mention your education background and the stream in which you are about to complete your graduation.
For any further clarification do post your query , in case this answer resolves your query, Please close it by marking it as Best Answer .
All the best!