How do you clear the IIT JEE if you have a bad foundation?
Sticking to basics rather than directly solving complex questions is good practice.
Yes Of course you will be easily able to solve questions by referring to the solutions but the problem is when you yourself try to solve them you will not be able to solve them and this is obviously because of a lack of conceptual understanding.
First of all make your theory part clear and solve solved examples on your own, gradually you will improve your concepts. Solve a variety of questions once you’re done with basic ones which will develop your logic to solve questions. Afterall practicing consistently will make you stand better in competition.
I would recommend you to join a NEET mentorship program for IIT JEE preparation. Here you will be connected to recent IIT JEE top rankers who will guide you and share with you some tips and tricks by which you could be ahead of your competitors