Transfer from one discipline to another (Dual to Single B.E. || B.E. to another B.E.) is difficult to a certain extent. As pointed in a different answer, ‘vertical’ transfer requires that you get a CGPA of above 9.5. To achieve such a score, you must make it to the top 10 in your batch.
Now look at it this way, in order to make a 9.5+ cgpa, you need to get an A in most of your courses. Since, about 800 people will be doing the course together, A will be awarded to 70 people on an average. So rather than trying to make it to the top 10 of your batch, if you could manage to get within the top 60 (to be safe) for most of your courses, the transfer is well within reach.
Since it is obvious that getting within the top 60 is relatively easy, now we’ll work towards it. You must attend lectures regularly. Speaking from personal experience, you will be tempted to not attend lectures of a few courses particularly because of the timings or the way it is being taught. Now, it is not necessary that you attend such lectures since there exists an alternative: practice questions of the said course in your room or the library. Practice such courses the day before its respective tutorials (test or not, irrelevant) for an hour, and BAM! You get good grades. And yes, not having a laptop would be helpful.