Your question is not complete. It seems like you are seeking for government college or government job. Getting a government job is a little difficult if you are a below average student. There is huge competition in government colleges as well as in government jobs. If you are SC/ST, then it will be beneficial.

Since you are completing diploma in 2018, I would suggest you to go for lateral entry in B.Tech for a reputed college. You can then get government college by giving LEET (Lateral Entry Entrance Examination). If you are looking for government jobs, then you must keep checking various job websites and advertisements in newspapers.

You havent completed the question. Are you asking about further study or a job? It is unclear from your question. Nevertheless, you can opt for lateral entry if you wish to pursue further study. For a Govt job, you have to check the job portals and ask in the placement division of your college. Many PSUs also ask for diploma holders. Better clarity can be had from your seniors and professors.