After successfuly completing your diploma you will be eligible for B.tech through lateral entry process in this process you would be get admissions directly into 2 nd year or 3rd semester of trade you have selected
You will not have to study applied sciences and mathematics
There are different process to get admissions in different institutes
For regional colleges and some private colleges state entrance examination is considered To make merit
Some deemed universities will conduct theor own entrance exams
If not able to come in merit in entrance exam you still can enroll through management seats but for higher fees
Related to C.E and Env engineering
Both fields have their merits in a developing country like India Construction of Highways Dams Buliding is going on continously so civil engineering has brighter future but due to development environmental degradation is also taking place that makes env engineering a brighter prospect
Ultimately its upto you and your interest furthermore the stream in which you have done your Diploma and gained knowledge will be best suitable
Rest is upto you to decide. Every field has oppurtunities its upto you to explore them
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