Hi aspirant,
It is very nice to hear that you will be pursuing a career in software engineering and being from same domain I can give you the best suggestions regarding it. If you want to get amazing packages and offers you need to to build your programming skills from as early as possible. During the four years of your engineering you will come across several languages which will include python, Java, c ,c plus plus JavaScript and many more. So you should start learning either python or java which act as the basic languages from now onwards so that you will have better understanding of algorithms and syntax of core programming. Once you will understand it it will be much much easier for you to do programming in other languages as well because you will get familiar to the algorithm and later you can start learning front end or backend development whichever you want to prefer.
It is not necessary that you will have to give three hours daily but make sure you practice at least 30 to 45 minutes per daily, starting from free resources. Free resources available online include geeks for geeks, W3 schools, hackerrank, leet code etc. Make sure you practice a lot of questions freely available online.
Hope it helps!!
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