any online websites or coaching for technical doubts in jee subjects?do you know about plancess guru guidance program for technical doubts?is it reliable for a dropper?(i have no teacher)

Yes ofcourse, askiitians.com is the best solution to your answer. Here with the normal cbse class we focus mostly on teaching JEE level to students . You will be enrolled in a batch and anytime you can ask your doubt because we have Batch discussion forum for our students. Its best if you yourself doing the preparation because self study is most imp thing to crack JEE but you have to do hardwork in a guided way in a correct way . Thats what every coaching provide you but if you want to save time then I would recommend you to join askIITians.com because its online session.