THANKS FOR A2A.
Okay that’s something really strange and difficult you have decide to do. The subjects, difficulty level and topics are poles apart. It is as equal as studying two streams. But if you have opted for it, trust me, you can do it.
For Physics, definitely you will have a better understamding as B.tech goes on. Chemistry and Biology are going to be the problem.
Since you are a dropper, you already know what is to be studied. For there is enough time, for Biology, give 3 days per chapter ( NCERT + COACHING MATERIAL + MCQS), and within 4 months, you’ll be done with Biology. Make own notes for Chemistry and make a formula list for Physics. Formula list might seem to be scary, but trust me, it helps towards the end.
Hope it helps