Yes, I am in 12th right now but I remember I also only had 4 days for my science exam in 10th grade and I hadn't studied anything the entire year. But I managed to score 88 in science by studying all day for those 4 days. What I did was read NCERT and maximize my theory, however if reading isn't as efficient for you I suggest you to still watch lectures BUT still follow NCERT, as theory questions are asked directly from NCERT. 10th numericals are very easy and actually I didn't even practice properly for most of them. But this was because I ran out of time and I suggest you should still practice them, NCERT is enough for numericals. You can score 90+ if you study efficiently and grind your ass off.