@dp.message_handler(lambda message: message.text.isdigit(), state=Form.password)
async def send_emai(message: types.Message, state: FSMContext):
    await Form.next()
    await state.update_data(password = int(message.text))
    await message.answer( "Укажите email: ")


@dp.message_handler(lambda message: '@' not in message.text , state=Form.email)
async def check_email (message: types.Message):
    return await message.reply("Некорректно введен email.\nУкажите email: ")


@dp.message_handler(lambda message: message.text.isdigit(), state=Form.email)
async def send_group(message: types.Message, state: FSMContext):
    await Form.next()
    await state.update_data(email = message.text)

    markup = types.ReplyKeyboardMarkup(resize_keyboard=True, selective=True)
    markup.add("ИС-16", "ИС-17", "ИС-18")
    markup.add("ИС-19", "ИЭ-17", "ИЭ-17")
    await message.answer( "Укажите вашу группу: ", reply_markup=markup)