M.Tech

Hello Aditya,
If you want to go for some additional courses, you can choose according to your choice and most important as per your interest.
If you want a job in designing, you can go for STAD and SAP for short time courses. You have the option of AutoCAD, civil 3D and architectural software.
You have a good option of diploma and short term course in Vastushashtra. A great choice can be safety management and labor management related courses which are available in open as well as various other institutes.
If you have an interest in planning and management, there are various courses in this field in both Masters, graduation as well as diploma level. Also, certification courses are available in institute like NICMAR which offers Masters in construction management that gives you chances of selection in top construction companies. Now a days GIS, GPS and navigation are having lots of scope and hence, you can go for that in Auto-desk sponsored coaching institutes.
Best of luck.

First of all, you need not do B.Tech and M.Tech to join Indian Army as technical officers. You have following options to join Indian Army as a commissioned officer:
(a) Join army through NDA and chose technical corp after completion of training at NDA & IMA. Army educates selected candidates to become mechanical and telecommunication engineer. Selection is based on NDA exam conducted by UPSC after B.Tech/M.Tech.
(b) Join OTS Chennai in 10+2 Technical Direct Entry scheme. This is open for male candidates who have passed 12th Class with physics, chemistry and mathematics with not less than 70%. Those who make it in merit list based on marks undergo SSB for selection. After 5 years at OTS and CME-Pune or MCTE or MCEME Secunderabad, candidates get engineering degree and job with starting salary of CTC of Rs 6+ Lakhs.
(c) University Entry Scheme to join in the final year of B.Tech degree.
It is recommended that you go for option (a) or (b). You will get B.Tech degree from JNU on the expenses of the government of India. Indian Army sponsors engineers for post graduation degree in IITs based on the performance in Army.