there are many youtube videos like mohit tyagi chanel and krishna and many more youtube channels but i found theses are the best and there will be videos for the solved papers also in which you can find the solved and model question paper and you should also refer some books too in which you can get the model questions like previous year questions in the  arihant series booklet and these all will definetly help you a lot , so hope that you will score good marks in jee and all the best for your coming exams